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@arpbot.bsky.social

Posting images of galaxies in Halton Arp's Atlas of Peculiar Galaxies (1966). Automated account. Image curation, descriptions, typos, and most alt text by astronomer @kellylepo.bsky.social. See posts for credits and links to the original sources.

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A two-panel image. The left panel is labeled Arp 297 GALEX. A scale bar marks 1 arcminute, which is about 1/8 the width of the frame. The panel shows a low-res image in shades of yellow and blue. There are four small galaxies, arranged in two pairs, on a field of stars. The bottom pair is a large face-on barred spiral galaxy and a smaller edge-on disk galaxy. The spiral has a bright, pale yellow, circular core. Two spiral arms circle around the core. One thinner arm emerges in the outer part of the galaxy at about 9 o'clock and circles counterclockwise to 12 o'clock, intersecting the companion galaxy to the left. The smaller companion galaxy is yellow and oval-shaped. The upper pair is two nearly face-on spiral galaxies. The bottom galaxy of the pair has a yellow core and bar with two faint spiral arms that make an S-shape. The top galaxy of the pair appears as a bluish grey circle.
The right panel is labeled Arp 297 SDSS and has a similar 1 arcminute scale bar. It shows the same galaxies at the same scale and is higher resolution. The bottom pair of galaxies appears in shades of pale yellow. The spiral appears similar to the GALEX image, but the center of the galaxy has a prominent bar structure, which was not seen by GALEX. The top pair of galaxies also is similar to the GALEX image, but shows more detail. The bottom galaxy of the pair is in shades of white and pale blue. The top galaxy has a bright core and barely discernible spiral arms and is in shades of yellow.

A two-panel image. The left panel is labeled Arp 297 GALEX. A scale bar marks 1 arcminute, which is about 1/8 the width of the frame. The panel shows a low-res image in shades of yellow and blue. There are four small galaxies, arranged in two pairs, on a field of stars. The bottom pair is a large face-on barred spiral galaxy and a smaller edge-on disk galaxy. The spiral has a bright, pale yellow, circular core. Two spiral arms circle around the core. One thinner arm emerges in the outer part of the galaxy at about 9 o'clock and circles counterclockwise to 12 o'clock, intersecting the companion galaxy to the left. The smaller companion galaxy is yellow and oval-shaped. The upper pair is two nearly face-on spiral galaxies. The bottom galaxy of the pair has a yellow core and bar with two faint spiral arms that make an S-shape. The top galaxy of the pair appears as a bluish grey circle. The right panel is labeled Arp 297 SDSS and has a similar 1 arcminute scale bar. It shows the same galaxies at the same scale and is higher resolution. The bottom pair of galaxies appears in shades of pale yellow. The spiral appears similar to the GALEX image, but the center of the galaxy has a prominent bar structure, which was not seen by GALEX. The top pair of galaxies also is similar to the GALEX image, but shows more detail. The bottom galaxy of the pair is in shades of white and pale blue. The top galaxy has a bright core and barely discernible spiral arms and is in shades of yellow.

GALEX and SDSS image of Arp 297, also known as NGC 5755, NGC 5753, NGC 5754 and NGC 5752.

The left image is in ultraviolet light. The right image is in visible light.

The upper and lower galaxy pairs are at different distances.

Credit: Fig. 13 from Smith et al. 2010.
Source

10.08.2025 12:31 — 👍 3    🔁 0    💬 0    📌 0
Arp 142, two interacting galaxies, take up less than a third of the frame. At the top is NGC 2937, nicknamed the Egg. Its center is brighter and whiter. There are six diffraction spikes atop its gauzy blue layers. At the center is NGC 2936, nicknamed the Penguin. In this view it is resting on its back, facing up. Its beak-like region points toward and above the Egg. Where the eye would be is a small, opaque yellow spiral. The Penguin’s distorted arms and thin red dust lanes from the bird’s beak, back, and tail. The tail is wide and layered, like a beta fish’s tail. A semi-transparent blue hue traces the Penguin and extends from the galaxy, creating an upside-down U over top of both galaxies. At bottom center-right is another galaxy seen from the side, pointing at an angle. It is largely light blue. Its length appears approximately as long as the Egg’s height. There are several foreground stars with large, bright blue diffraction spikes. The wide black background is filled with tiny, extremely distant galaxies.

Arp 142, two interacting galaxies, take up less than a third of the frame. At the top is NGC 2937, nicknamed the Egg. Its center is brighter and whiter. There are six diffraction spikes atop its gauzy blue layers. At the center is NGC 2936, nicknamed the Penguin. In this view it is resting on its back, facing up. Its beak-like region points toward and above the Egg. Where the eye would be is a small, opaque yellow spiral. The Penguin’s distorted arms and thin red dust lanes from the bird’s beak, back, and tail. The tail is wide and layered, like a beta fish’s tail. A semi-transparent blue hue traces the Penguin and extends from the galaxy, creating an upside-down U over top of both galaxies. At bottom center-right is another galaxy seen from the side, pointing at an angle. It is largely light blue. Its length appears approximately as long as the Egg’s height. There are several foreground stars with large, bright blue diffraction spikes. The wide black background is filled with tiny, extremely distant galaxies.

JWST NIRCam image of Arp 142, also known as NGC 2936 and NGC 2937, or the Penguin and the Egg.

In this wide view, we see the Penguin and the Egg galaxies, a foreground edge-on spiral, and a large number of distant galaxies.

Credit: NASA, ESA, CSA, STScI
Source

10.08.2025 00:31 — 👍 21    🔁 2    💬 0    📌 0
A face-on spiral galaxy has a yellow core. Several spiral arms, dotted with blue stars and star clusters, spiral clockwise around the core. They are crossed by filamentary dust lanes. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Another arm follows more closely to the core, from about 6 o'clock to 12 o'clock. Three other arms cover the area from 12 o'clock to 6 o'clock.

A face-on spiral galaxy has a yellow core. Several spiral arms, dotted with blue stars and star clusters, spiral clockwise around the core. They are crossed by filamentary dust lanes. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Another arm follows more closely to the core, from about 6 o'clock to 12 o'clock. Three other arms cover the area from 12 o'clock to 6 o'clock.

Hubble Space Telescope image of Arp 26, also known as M101 or the Pinwheel Galaxy.

The image is made from 51 individual Hubble exposures, plus data from the Canada-France-Hawaii Telescope and Kitt Peak National Observatory.

Credit: NASA, ESA, STScI; CFHT, NOAO, AURA, NSF
Source

09.08.2025 12:31 — 👍 99    🔁 17    💬 1    📌 1
A pair of interacting spiral galaxies. On the left is a large spiral galaxy. It's disk is tilted, so that it appears as a oval rather than a circle. It has a bright yellow-white center that transitions into spiral arms. The arms are defined by dark brown dust lanes. The area in between is filled with a haze of blue-white stars. Below and to the right is a second galaxy, a smaller, distorted spiral. In its center is a bright yellow nucleus surrounded by a ring of stars. The lower left part of the ring has a concentrated area of dust. Extending from the ring are two large, thin spiral arms, dotted with blue star clusters, forming an S-shape. The upper arm appears to touch the edge of the disk of its companion galaxy. On the black background of space are foreground stars, some with diffraction spikes, and tiny background galaxies.

A pair of interacting spiral galaxies. On the left is a large spiral galaxy. It's disk is tilted, so that it appears as a oval rather than a circle. It has a bright yellow-white center that transitions into spiral arms. The arms are defined by dark brown dust lanes. The area in between is filled with a haze of blue-white stars. Below and to the right is a second galaxy, a smaller, distorted spiral. In its center is a bright yellow nucleus surrounded by a ring of stars. The lower left part of the ring has a concentrated area of dust. Extending from the ring are two large, thin spiral arms, dotted with blue star clusters, forming an S-shape. The upper arm appears to touch the edge of the disk of its companion galaxy. On the black background of space are foreground stars, some with diffraction spikes, and tiny background galaxies.

Kitt Peak image of Arp 84, also known as NGC 5394 and NGC 5395.

Interactions between the galaxy pair funneled gas into the center of NGC 5394, the smaller spiral, providing the raw materials for new stars.

Credit: KPNO, NOIRLab, NSF, AURA, D. Matthews, E. J. Jones, A. Block
Source

09.08.2025 00:31 — 👍 10    🔁 1    💬 0    📌 0
A grainy, black and white image of two interacting spiral galaxies. The larger galaxy in the upper left part of the frame has a bright central core surrounded by a long bar structure. The bar is crossed by dark dust lanes. Emerging from the bar is the beginning of one spiral arm at about 6 o'clock that curves upward. There are additional, barely visible spiral arms that wrap around the galaxy. The smaller galaxy in the bottom left portion of the frame has a bright, oval-shaped central region, and very faint, wispy spiral arms. The black background of space is filled with small galaxies and white dots, which are foreground stars.

A grainy, black and white image of two interacting spiral galaxies. The larger galaxy in the upper left part of the frame has a bright central core surrounded by a long bar structure. The bar is crossed by dark dust lanes. Emerging from the bar is the beginning of one spiral arm at about 6 o'clock that curves upward. There are additional, barely visible spiral arms that wrap around the galaxy. The smaller galaxy in the bottom left portion of the frame has a bright, oval-shaped central region, and very faint, wispy spiral arms. The black background of space is filled with small galaxies and white dots, which are foreground stars.

Image of Arp 290, also known as IC 195 and IC 196, from Halton Arp's Atlas of Peculiar Galaxies (1966).

In the original catalog it was in the category: Double and multiple galaxies - Wind effects. IC 196 is the larger galaxy, IC 195 is the smaller.
Source

08.08.2025 12:31 — 👍 11    🔁 2    💬 0    📌 0
Five galaxies appear close to each other in the sky. At upper left, a spiral galaxy is tilted, appearing wider than it is tall. It has a glowing yellow center and reddish-brown dust trails that spiral clockwise around it. Above the center is a large elliptical galaxy. Its round, glowing yellow center is surrounded by a fuzzy yellow halo that fades away from the core. Toward the bottom right are three galaxies that appear to touch. The largest is in the center: a nearly vertical, edge-on spiral galaxy. Its glowing yellow core is mostly obscured by reddish-brown dust trails dotted with blue stars. To its bottom left is a smaller, tilted spiral galaxy with a glowing yellow center. Reddish-brown dust trails are dotted with blue stars. One spiral arm appears to touch the vertical galaxy to its right. At the spiral’s bottom right is a lenticular galaxy with a glowing central core in the middle of a hazy yellow disk, appearing almost face-on. It seems to touch the large spiral galaxy above it.

Five galaxies appear close to each other in the sky. At upper left, a spiral galaxy is tilted, appearing wider than it is tall. It has a glowing yellow center and reddish-brown dust trails that spiral clockwise around it. Above the center is a large elliptical galaxy. Its round, glowing yellow center is surrounded by a fuzzy yellow halo that fades away from the core. Toward the bottom right are three galaxies that appear to touch. The largest is in the center: a nearly vertical, edge-on spiral galaxy. Its glowing yellow core is mostly obscured by reddish-brown dust trails dotted with blue stars. To its bottom left is a smaller, tilted spiral galaxy with a glowing yellow center. Reddish-brown dust trails are dotted with blue stars. One spiral arm appears to touch the vertical galaxy to its right. At the spiral’s bottom right is a lenticular galaxy with a glowing central core in the middle of a hazy yellow disk, appearing almost face-on. It seems to touch the large spiral galaxy above it.

Hubble image of Arp 321, also known as Hickson 40.

This group of galaxies include three spiral galaxies, an elliptical galaxy, and a lenticular (lens-like) galaxy.

Credit: NASA, ESA, STScI, A. Pagan
Source

08.08.2025 00:31 — 👍 34    🔁 7    💬 0    📌 0
Two small galaxies appear on a sparse field of stars. At center left is NGC 2523, a face-on barred spiral. It has a bright yellow central core with a horizontal bar-shaped structure that connects to a thin ring. The area between the ring, core, and bar is dark. This central part looks like a steering wheel. The spiral arms originate at the ring and spiral outward counterclockwise. The arms are dotted by blue star clusters and shrouded in a haze of stars. At right center is NGC 2523B, an edge-on spiral.  It has a yellow central bulge and a blue disk, which is crossed by a central brown dust lane.

Two small galaxies appear on a sparse field of stars. At center left is NGC 2523, a face-on barred spiral. It has a bright yellow central core with a horizontal bar-shaped structure that connects to a thin ring. The area between the ring, core, and bar is dark. This central part looks like a steering wheel. The spiral arms originate at the ring and spiral outward counterclockwise. The arms are dotted by blue star clusters and shrouded in a haze of stars. At right center is NGC 2523B, an edge-on spiral. It has a yellow central bulge and a blue disk, which is crossed by a central brown dust lane.

Kitt Peak National Observatory image of Arp 9, also known as NGC 2523.

NGC 2523 is the bright barred spiral galaxy on the left side of the frame. The edge-on spiral galaxy to the right, NGC 2523 B, is in the same galaxy group.

Credit: KPNO, NOIRLab, NSF, AURA, Adam Block
Source

07.08.2025 12:31 — 👍 7    🔁 3    💬 0    📌 1
Three widely separated galaxies on the black background of space. The galaxy at the upper left is an edge-on spiral, seen as a wide, bright line with a dark dust lane going through the middle. The galaxy at lower left is a face-on barred spiral galaxy, with a bright central bar and two spiral arms, which form an S-shape. The galaxy at lower right is a nearly face-on spiral, with a bright nucleus and curving dust lanes. Several foreground stars dot the image.

Three widely separated galaxies on the black background of space. The galaxy at the upper left is an edge-on spiral, seen as a wide, bright line with a dark dust lane going through the middle. The galaxy at lower left is a face-on barred spiral galaxy, with a bright central bar and two spiral arms, which form an S-shape. The galaxy at lower right is a nearly face-on spiral, with a bright nucleus and curving dust lanes. Several foreground stars dot the image.

Burrell Schmidt telescope image of Arp 16, also known as M66.

M66 is part of the Leo Triplet, a small galaxy group. Edge-on spiral NGC 3628 is at upper left. The nearly face-on spirals M66 and M65 are at lower left and lower right.

Credit: REU program, NOIRLab, NSF, AURA
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07.08.2025 00:31 — 👍 29    🔁 2    💬 0    📌 0
A grainy, black and white image of a spiral galaxy. It has poorly defined spiral arms that are dotted with star clusters. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. Many white dots, which are stars, are seen on the black background.

A grainy, black and white image of a spiral galaxy. It has poorly defined spiral arms that are dotted with star clusters. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. Many white dots, which are stars, are seen on the black background.

Image of Arp 14, also known as NGC 7314, from Halton Arp's Atlas of Peculiar Galaxies (1966).

In the original catalog it was in the category: Spiral galaxies - Detached segments. It has an active supermassive black hole at its center.
Source

06.08.2025 12:31 — 👍 39    🔁 1    💬 0    📌 0
A greyscale image of a spiral galaxy. The faint galaxy has a central bar and two spiral arms that wind clockwise around the galaxy. The arms are crossed by dark dust lanes and  dotted with bright star clusters. The image has some detector noise and lines from cosmic rays, which have not been removed.

A greyscale image of a spiral galaxy. The faint galaxy has a central bar and two spiral arms that wind clockwise around the galaxy. The arms are crossed by dark dust lanes and dotted with bright star clusters. The image has some detector noise and lines from cosmic rays, which have not been removed.

Hubble Space Telescope image of Arp 15, also known as NGC 7393.

NGC 7393 is a barred spiral galaxy in the constellation Aquarius.

Credit: NASA, ESA, STScI, Julianne Dalcanton, Meli thev, Wikimedia Commons
Source

06.08.2025 00:31 — 👍 10    🔁 1    💬 0    📌 0
A pair of interacting spiral galaxies. The galaxy in the center appears face-on with a bright center, surrounded by swirls of dark dust filaments. The outer areas of the galaxy are filled with a haze of pale stars. To the left is its companion galaxy. The disk of this galaxy is seen at an angle, tilted so that it appears to be an oval rather than a circle. Dark dust filaments somewhat obscure the spiral structures in its disk, which is filled with star clusters. At the bottom left edge of this galaxy, the end of a spiral arm or a tidal tail appears to extend downwards, connecting to the side of its companion. At the top edge of the central galaxy is what appears to be a faint tidal tail, dotted with star clusters, perhaps a continuation of the tail from the companion galaxy. The black background of space is dotted with foreground stars and tiny background galaxies.

A pair of interacting spiral galaxies. The galaxy in the center appears face-on with a bright center, surrounded by swirls of dark dust filaments. The outer areas of the galaxy are filled with a haze of pale stars. To the left is its companion galaxy. The disk of this galaxy is seen at an angle, tilted so that it appears to be an oval rather than a circle. Dark dust filaments somewhat obscure the spiral structures in its disk, which is filled with star clusters. At the bottom left edge of this galaxy, the end of a spiral arm or a tidal tail appears to extend downwards, connecting to the side of its companion. At the top edge of the central galaxy is what appears to be a faint tidal tail, dotted with star clusters, perhaps a continuation of the tail from the companion galaxy. The black background of space is dotted with foreground stars and tiny background galaxies.

Hubble image of Arp 91, also known as NGC 5953 and NGC 5954.

NGC 5953 (center) and NGC 5954 (left) show clear signs of interaction. A spiral arm or tidal tail from NGC 5954 extends to the side and connects to its companion.

Credit: ESA, NASA, J. Dalcanton, J. Schmidt
Source

05.08.2025 12:31 — 👍 127    🔁 20    💬 3    📌 0
A spiral galaxy with a small, bright, circular core. The muted, yellowish-green spiral arms wind clockwise around the yellow core. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. In the background are scattered red, yellow and green dots, which are stars.

A spiral galaxy with a small, bright, circular core. The muted, yellowish-green spiral arms wind clockwise around the yellow core. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. In the background are scattered red, yellow and green dots, which are stars.

Sloan Digital Sky Survey image of Arp 8, also known as NGC 497.

NGC 497 is a barred spiral galaxy about 370 million light years away in the constellation Cetus.

Credit: SDSS
Source

05.08.2025 00:31 — 👍 26    🔁 3    💬 0    📌 1
A greyscale image of a spiral galaxy and its smaller companion. The frame is dominated by the large spiral. It has a small core that sits in the middle of a spiral structure. The one spiral arm begins at about 9 o'clock and curves clockwise around the galaxy, completing a full circle. The arm is unusually thick, fanning out with many bright star clusters. To the left of the spiral is a smaller galaxy, seen almost edge-on. It appears as an elongated oval dotted with stars. The long axis of the oval is almost horizontal. Connecting the two galaxies is a faint bridge of gas and stars. A few smaller background galaxies dot the black background of space. The image has some detector noise which have not been removed.

A greyscale image of a spiral galaxy and its smaller companion. The frame is dominated by the large spiral. It has a small core that sits in the middle of a spiral structure. The one spiral arm begins at about 9 o'clock and curves clockwise around the galaxy, completing a full circle. The arm is unusually thick, fanning out with many bright star clusters. To the left of the spiral is a smaller galaxy, seen almost edge-on. It appears as an elongated oval dotted with stars. The long axis of the oval is almost horizontal. Connecting the two galaxies is a faint bridge of gas and stars. A few smaller background galaxies dot the black background of space. The image has some detector noise which have not been removed.

Hubble image of Arp 24, also known as NGC 3445.

NGC 3445 has one fan-like spiral arm that is dotted with star-forming regions. It is connected to its companion galaxy, seen nearly edge-on to the left, by a weak bridge.

Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt
Source

04.08.2025 12:31 — 👍 5    🔁 2    💬 0    📌 1
A large spiral galaxy is seen in the center of the frame. It's tilted at an angle, so that it's disk appears as an oval rather than a circle. Dramatic dust lanes cross in front of the center of the galaxy and are backlit by a haze of yellow-white stars. Below the spiral is a smaller disk galaxy seen in shades of blue white. It appears to be at almost a right angle to the large spiral, falling out of the larger galaxy. The two galaxies are connected by a bridge of dusty tendrils, which are also backlit by the main galaxy. This galaxy pair looks a lot more 3D than most interacting galaxies because of their angles and the backlighting effect.

A large spiral galaxy is seen in the center of the frame. It's tilted at an angle, so that it's disk appears as an oval rather than a circle. Dramatic dust lanes cross in front of the center of the galaxy and are backlit by a haze of yellow-white stars. Below the spiral is a smaller disk galaxy seen in shades of blue white. It appears to be at almost a right angle to the large spiral, falling out of the larger galaxy. The two galaxies are connected by a bridge of dusty tendrils, which are also backlit by the main galaxy. This galaxy pair looks a lot more 3D than most interacting galaxies because of their angles and the backlighting effect.

Hubble and Legacy Survey image of Arp 282, also known as NGC 169 and NGC 169A.

Interactions between the two galaxies create delicate streams that visibly link the pair.

Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, Legacy Surveys, D. Lang, NERSC
Source

04.08.2025 00:31 — 👍 166    🔁 25    💬 2    📌 1
A pair of spiral galaxies, one seen nearly edge-on and one seen face-on. The face-on spiral to the right has a bright yellow central core and two well-defined spiral arms that loop counterclockwise around the galaxy. The inner parts of the spiral arms are yellow, while the outer arms fan out into blue stars and star clusters. One spiral arm begins at about 6 o'clock, curls around to the top of the galaxy at 12 o'clock and then ends at the bottom of the galaxy around 6 o'clock. The second arm begins at around 9 o'clock and curls around, ending at the top of the galaxy around 12 o'clock. The nearly edge-on galaxy to the left overlaps at the top of the face-on galaxy, appearing like a continuation of the face-on galaxy's second spiral arm. It's disk is tilted, so it appears as a long, thin oval rather than a circle. The galaxy also has a yellow central core and an outer edge dotted with blue star clusters. In the black background of space are a few other colorful dots, which are foreground stars or background galaxies.

A pair of spiral galaxies, one seen nearly edge-on and one seen face-on. The face-on spiral to the right has a bright yellow central core and two well-defined spiral arms that loop counterclockwise around the galaxy. The inner parts of the spiral arms are yellow, while the outer arms fan out into blue stars and star clusters. One spiral arm begins at about 6 o'clock, curls around to the top of the galaxy at 12 o'clock and then ends at the bottom of the galaxy around 6 o'clock. The second arm begins at around 9 o'clock and curls around, ending at the top of the galaxy around 12 o'clock. The nearly edge-on galaxy to the left overlaps at the top of the face-on galaxy, appearing like a continuation of the face-on galaxy's second spiral arm. It's disk is tilted, so it appears as a long, thin oval rather than a circle. The galaxy also has a yellow central core and an outer edge dotted with blue star clusters. In the black background of space are a few other colorful dots, which are foreground stars or background galaxies.

Gran Telescopio Canarias image of Arp 30, also known as NGC 6365.

Arp thought this was one galaxy with a particularly beefy arm. Later images show this is actually a pair of interacting galaxies, with one galaxy viewed face-on and one viewed nearly edge-on.

Credit: GTC, IAC
Source

03.08.2025 12:31 — 👍 8    🔁 1    💬 0    📌 0
A grainy, black and white image of a spiral galaxy with a small, bright, circular core. The poorly-defined spiral arms wind clockwise around the core. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. A few white dots, which are stars, are seen on the black background.

A grainy, black and white image of a spiral galaxy with a small, bright, circular core. The poorly-defined spiral arms wind clockwise around the core. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. A few white dots, which are stars, are seen on the black background.

Image of Arp 13, also known as NGC 7448, from Halton Arp's Atlas of Peculiar Galaxies (1966).

In the original catalog it was in the category: Spiral galaxies - Detached segments. It has particularly bright spiral arms.
Source

03.08.2025 00:31 — 👍 15    🔁 0    💬 0    📌 0
A spiral galaxy has a yellow core and poorly defined spiral arms that are dotted with blue star clusters and crossed by dark brown dust lanes. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. The image has a staircase-like shape, with a black area in the upper right corner, characteristic of images made with Hubble's Wide Field and Planetary Camera 2.

A spiral galaxy has a yellow core and poorly defined spiral arms that are dotted with blue star clusters and crossed by dark brown dust lanes. The galaxy is tilted slightly, so it forms an oval shape, rather than a circle. The image has a staircase-like shape, with a black area in the upper right corner, characteristic of images made with Hubble's Wide Field and Planetary Camera 2.

Hubble Space Telescope image of Arp 14, also known as NGC 7314.

NGC 7314 is about 50 million light years away. It has a bright core and an active supermassive black hole at its center.

Credit: NASA, ESA, STScI, Solomon Hendrix
Source

02.08.2025 12:31 — 👍 37    🔁 7    💬 0    📌 0
A grainy, black and white image of a group of several spiral galaxies. The upper galaxy, UGC 717, has a small core, and a bar surrounded by a ring structure. On the outside of the ring are several spiral arms, including one arm that splits in two as it curves around the left side of the galaxy. The spiral in the bottom left, UGC 719, has a small core, and a bar surrounded by a ring structure. On the outside of the ring are several somewhat ill-defined spiral arms. In the background are several other smaller galaxies. Many white dots, which are stars, are seen on the black background.

A grainy, black and white image of a group of several spiral galaxies. The upper galaxy, UGC 717, has a small core, and a bar surrounded by a ring structure. On the outside of the ring are several spiral arms, including one arm that splits in two as it curves around the left side of the galaxy. The spiral in the bottom left, UGC 719, has a small core, and a bar surrounded by a ring structure. On the outside of the ring are several somewhat ill-defined spiral arms. In the background are several other smaller galaxies. Many white dots, which are stars, are seen on the black background.

Image of Arp 11, also known as UGC 717, from Halton Arp's Atlas of Peculiar Galaxies (1966).

In the original catalog it was in the category: Spiral galaxies - Split arms. UGC 717 is the large spiral galaxy at center.
Source

02.08.2025 00:31 — 👍 7    🔁 1    💬 0    📌 0
Three overlapping galaxies fill the frame. In the center are two large spiral galaxies. The larger one, at center-left, has a bright nucleus surrounded by a yellow-white core made of mostly older stars. At the edge of the core, two spiral arms emerge. One begins at about 6 o'clock and curves counter-clockwise to about 12 o'clock. The second begins at about 12 o'clock and curves down to about 8 o'clock, with a fainter part of the arm continuing on to about 5 o'clock. The arms are threaded with brown dust lanes. A few pink star-forming regions and blue star clusters dot the outer portion of the arm. The second spiral galaxy is at center-right. It has a bright center, and a well-defined bar and two spiral arms. Together, the bar and arms form an S-shape. Compared to its companion, this galaxy has less dust and more blue star clusters in its arms. The final galaxy in the triplet appears at the far left of the frame. It is much smaller than its companions and has a blobby, irregular appearance, although it could be a disrupted disk seen edge-on. It has a bright yellow-white center and an almost vertical line of blue star clusters. Dotted throughout the galaxy are pink star-forming regions. A few stars appear on the black background of space, including two large foreground stars, which appear above the center-right galaxy.

Three overlapping galaxies fill the frame. In the center are two large spiral galaxies. The larger one, at center-left, has a bright nucleus surrounded by a yellow-white core made of mostly older stars. At the edge of the core, two spiral arms emerge. One begins at about 6 o'clock and curves counter-clockwise to about 12 o'clock. The second begins at about 12 o'clock and curves down to about 8 o'clock, with a fainter part of the arm continuing on to about 5 o'clock. The arms are threaded with brown dust lanes. A few pink star-forming regions and blue star clusters dot the outer portion of the arm. The second spiral galaxy is at center-right. It has a bright center, and a well-defined bar and two spiral arms. Together, the bar and arms form an S-shape. Compared to its companion, this galaxy has less dust and more blue star clusters in its arms. The final galaxy in the triplet appears at the far left of the frame. It is much smaller than its companions and has a blobby, irregular appearance, although it could be a disrupted disk seen edge-on. It has a bright yellow-white center and an almost vertical line of blue star clusters. Dotted throughout the galaxy are pink star-forming regions. A few stars appear on the black background of space, including two large foreground stars, which appear above the center-right galaxy.

Hubble image of Arp 274, also known as NGC 5679.

NGC 5679 is a system of three interacting galaxies, the two large, overlapping spiral galaxies at center, and a smaller companion galaxy to the far left.

Credit: NASA, ESA, STScI, Hubble Heritage Team
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01.08.2025 12:31 — 👍 7    🔁 1    💬 0    📌 0
A black and white image of a pair of spiral galaxies. The larger galaxy to the upper left is seen nearly face-on. It has a small core and a short bar that transitions into spiral arms that are dotted with bright star clusters. More star clusters appear on the right of the galaxy, the side that faces its companion. There are a few dark dust lanes, concentrated near the inner spiral arms. The smaller spiral galaxy to the lower right has a bright bar structure that is surrounded by star clusters that only very roughly form spiral arms. On the bottom of the galaxy there is a knot of stars that is brightest in its center, crossed by dark dust lanes. This may be a seperate dwarf galaxy that is either in front of the smaller spiral or is in the process of merging with it. Other distant galaxies and stars fill the black background of space.

A black and white image of a pair of spiral galaxies. The larger galaxy to the upper left is seen nearly face-on. It has a small core and a short bar that transitions into spiral arms that are dotted with bright star clusters. More star clusters appear on the right of the galaxy, the side that faces its companion. There are a few dark dust lanes, concentrated near the inner spiral arms. The smaller spiral galaxy to the lower right has a bright bar structure that is surrounded by star clusters that only very roughly form spiral arms. On the bottom of the galaxy there is a knot of stars that is brightest in its center, crossed by dark dust lanes. This may be a seperate dwarf galaxy that is either in front of the smaller spiral or is in the process of merging with it. Other distant galaxies and stars fill the black background of space.

Hubble image of Arp 300, also known as UGC 05028 and UGC 05029.

UGC 05028 (smaller spiral) and UGC 05029 (larger spiral) form an interacting galaxy pair. The bright knot in UGC 05028 may be another small galaxy.

Credit: NASA, ESA, STScI, J. Dalcanton, Judy Schmidt, PanSTARRS
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01.08.2025 00:31 — 👍 8    🔁 1    💬 0    📌 0

Also known as Arp 184.

31.07.2025 15:15 — 👍 11    🔁 2    💬 0    📌 0
Two similar-looking spiral galaxies take up most of the frame. They both have bright, yellow-white central cores and well-defined spiral arms dotted with blue star clusters and dark dust lanes. NGC 5427 is a nearly face-on spiral galaxy at left. NGC 5426 is a more oblique galaxy at right. The two spiral arms on the upper side of NGC 5426 appear as a bridge that connects with NGC 5427. The black background of space is dotted with stars and small background galaxies.

Two similar-looking spiral galaxies take up most of the frame. They both have bright, yellow-white central cores and well-defined spiral arms dotted with blue star clusters and dark dust lanes. NGC 5427 is a nearly face-on spiral galaxy at left. NGC 5426 is a more oblique galaxy at right. The two spiral arms on the upper side of NGC 5426 appear as a bridge that connects with NGC 5427. The black background of space is dotted with stars and small background galaxies.

Very Large Telescope image of Arp 271, also known as NGC 5426 and NGC 5427.

This pair of interacting galaxies was the final image captured by the VIsible Multi-Object Spectrograph (VIMOS) instrument before it was decommissioned in 2018.

Credit: ESO, Juan Carlos Muñoz
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31.07.2025 12:31 — 👍 61    🔁 13    💬 1    📌 0
A greyscale image of a one-armed barred spiral galaxy fills most of the frame. The bar, seen as a bright line of stars and star clusters anchors the galaxy. Beginning at about the 3 o'clock position, a spiral arm wraps clockwise around the galaxy, ending at around 12 o'clock. The arm is formed from a haze of stars and are dotted with bright star clusters. In the upper part of the frame, partially cut off at the right edge, is a smaller galaxy. It has a bright center and a more diffuse disk or halo of stars. Dotted across the black background of space are small background galaxies and foreground stars. The image has a noticeable amount of detector noise which has not been removed.

A greyscale image of a one-armed barred spiral galaxy fills most of the frame. The bar, seen as a bright line of stars and star clusters anchors the galaxy. Beginning at about the 3 o'clock position, a spiral arm wraps clockwise around the galaxy, ending at around 12 o'clock. The arm is formed from a haze of stars and are dotted with bright star clusters. In the upper part of the frame, partially cut off at the right edge, is a smaller galaxy. It has a bright center and a more diffuse disk or halo of stars. Dotted across the black background of space are small background galaxies and foreground stars. The image has a noticeable amount of detector noise which has not been removed.

Hubble image of Arp 291, also known as UGC 5832.

This one-armed barred spiral galaxy may be interacting with the small galaxy in the upper right corner of the frame.

Credit: NASA, ESA, STScI, Julianne Dalcanton, Meli thev, Wikimedia Commons
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31.07.2025 00:31 — 👍 35    🔁 5    💬 1    📌 0
A nearly face-on spiral galaxy sits at the center of the frame, on a field of stars. It has a yellow center and blue spiral arms that twist clockwise around the galaxy. Surrounding the galaxy is a faint, oval-shaped haze of stars. In the left of the oval is a line and an arc, which resemble the shape of an umbrella. An insert shows a closeup of the line and the location of a star cluster, seen as a white dot.

A nearly face-on spiral galaxy sits at the center of the frame, on a field of stars. It has a yellow center and blue spiral arms that twist clockwise around the galaxy. Surrounding the galaxy is a faint, oval-shaped haze of stars. In the left of the oval is a line and an arc, which resemble the shape of an umbrella. An insert shows a closeup of the line and the location of a star cluster, seen as a white dot.

Subaru Telescope and Blackbird Observatory image of Arp 189, also known as NGC 4651 or the Umbrella Galaxy.

The parasol-shaped feature to the left is debris from a tiny galaxy that was shredded apart by gravity as it fell into its larger companion.

Credit: NAOJ, R. Jay GaBany
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30.07.2025 12:31 — 👍 22    🔁 2    💬 0    📌 1
A face-on barred spiral galaxy fills most of the frame. It has a yellow central core and horizontal bar structure. Attached to the bar are several spiral arms which originate at the end of the bar and spiral clockwise. The arms are somewhat squished, so the galaxy appears oval-shaped, longer than it is tall. There are two foreground stars with diffraction spikes, one right above the core of the galaxy and one to the lower right. The black background of space is dotted with numerous tiny, distant galaxies.

A face-on barred spiral galaxy fills most of the frame. It has a yellow central core and horizontal bar structure. Attached to the bar are several spiral arms which originate at the end of the bar and spiral clockwise. The arms are somewhat squished, so the galaxy appears oval-shaped, longer than it is tall. There are two foreground stars with diffraction spikes, one right above the core of the galaxy and one to the lower right. The black background of space is dotted with numerous tiny, distant galaxies.

Hubble Space Telescope image of Arp 12, also known as NGC 2608.

NGC 2608 is a barred spiral galaxy. Its arms are peppered by blue star clusters and red star forming regions and crossed by brown dust lanes.

Credit: ESA, NASA, A. Riess et al.
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30.07.2025 00:31 — 👍 41    🔁 4    💬 0    📌 0
The frame is dominated by three spiral galaxies in shades of yellow and blue. The largest is at the center of the frame. The disk of the galaxy is tilted, so that it appears oval-shaped, with the long axis running diagonally from upper right to lower left. It has a bright yellow center, surrounded by a ring structure. Emerging from the ring are two spiral arms, defined by blue star clusters. The arms for a tiled, backward S-shape. At the bottom left is a smaller face-on spiral galaxy. Unlike the other two galaxies in the group, this galaxy does not appear distorted. It has a small core, surrounded by loose spiral arms that are filled with blue star clusters. At upper left is a distorted spiral galaxy seen nearly edge-on. Its disk is warped, forming a thin, nearly vertical, backward S-shape.

The frame is dominated by three spiral galaxies in shades of yellow and blue. The largest is at the center of the frame. The disk of the galaxy is tilted, so that it appears oval-shaped, with the long axis running diagonally from upper right to lower left. It has a bright yellow center, surrounded by a ring structure. Emerging from the ring are two spiral arms, defined by blue star clusters. The arms for a tiled, backward S-shape. At the bottom left is a smaller face-on spiral galaxy. Unlike the other two galaxies in the group, this galaxy does not appear distorted. It has a small core, surrounded by loose spiral arms that are filled with blue star clusters. At upper left is a distorted spiral galaxy seen nearly edge-on. Its disk is warped, forming a thin, nearly vertical, backward S-shape.

GALEX image of Arp 286, also known as NGC 5560, NGC 5566, and NGC 5569.

Ultraviolet light shows the youngest, hottest stars in this interacting galaxy triplett. NGC 5566 is at center, NGC 5569 at bottom left, and NGC 5560 at top left.

Credit: NASA, JPL-Caltech
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29.07.2025 12:31 — 👍 114    🔁 14    💬 1    📌 0
A grainy, black and white image of two merging galaxies that form an abstract shape, which looks a little like a rubber duck. Within the "head" and "body" of the duck are dark swirls, which are dust and gas. The outside of the duck is outlined with hazy swirls, which are streams of stars.

A grainy, black and white image of two merging galaxies that form an abstract shape, which looks a little like a rubber duck. Within the "head" and "body" of the duck are dark swirls, which are dust and gas. The outside of the duck is outlined with hazy swirls, which are streams of stars.

Image of Arp 299, also known as NGC 3690, from Halton Arp's Atlas of Peculiar Galaxies (1966).

In the original catalog it was in the category: Double and multiple galaxies - Unclassified objects. Interactions between the pair triggered a starburst.
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29.07.2025 00:31 — 👍 9    🔁 0    💬 0    📌 0
Four-panel image made of one large panel on the left with a multiwavelength image of the face-on spiral galaxy M101 from NASA's Great Observatories, with three additional panels stacked vertically on the right showing single-color images from Spitzer, Hubble, and Chandra. In the multi-wavelength image, the galaxy has a small yellow core. Several  arms spiral clockwise around the core. They are crossed by red, filamentary dust lanes and made of a haze of yellow stars. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Another arm follows more closely to the core, from about 6 o'clock to 12 o'clock. Three other arms cover the area from 12 o'clock to 6 o'clock. Near the center of the galaxy, especially on the left side, is a blue haze and many blue dots. In the red Spitzer image in the top right panel, we see a network of filentary dust lanes. The spiral arms are present, but they are not as distinct as in the visible light view. In the yellow Hubble image in the middle right panel, the spiral arms are well-defined and are crossed by dark dust lanes. In the blue Chandra image in the panel at bottom right, blue splotches partially define spiral arms. These arms are smaller and less distinct than in the other views. Dots are scattered throughout the image, including a concentration of points at the galaxy's core. Credit NASA, ESA, CXC, SSC, and STScI. STScI-PRC09-07A.

Four-panel image made of one large panel on the left with a multiwavelength image of the face-on spiral galaxy M101 from NASA's Great Observatories, with three additional panels stacked vertically on the right showing single-color images from Spitzer, Hubble, and Chandra. In the multi-wavelength image, the galaxy has a small yellow core. Several arms spiral clockwise around the core. They are crossed by red, filamentary dust lanes and made of a haze of yellow stars. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Another arm follows more closely to the core, from about 6 o'clock to 12 o'clock. Three other arms cover the area from 12 o'clock to 6 o'clock. Near the center of the galaxy, especially on the left side, is a blue haze and many blue dots. In the red Spitzer image in the top right panel, we see a network of filentary dust lanes. The spiral arms are present, but they are not as distinct as in the visible light view. In the yellow Hubble image in the middle right panel, the spiral arms are well-defined and are crossed by dark dust lanes. In the blue Chandra image in the panel at bottom right, blue splotches partially define spiral arms. These arms are smaller and less distinct than in the other views. Dots are scattered throughout the image, including a concentration of points at the galaxy's core. Credit NASA, ESA, CXC, SSC, and STScI. STScI-PRC09-07A.

Multiwavelength image of Arp 26, also known as M101 or the Pinwheel Galaxy.

Spitzer's infrared light emphasizes dust, Hubble's visible light highlights stars, and Chandra's X-ray view shows hot objects like gas and black holes.

Credit: NASA, ESA, CXC, SSC, and STScI
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28.07.2025 12:31 — 👍 5    🔁 1    💬 0    📌 0
A pair of interacting galaxies. The larger of the two is slightly right of center. It is a one-armed spiral galaxy with a hazy, bright, white center and a ring of blue, gaseous filaments. The center of this galaxy shows JWST’s eight-pronged diffraction pattern. The single spiral arm begins at about the 7 o'clock position and spirals counterclockwise to the 12 o'clock position, forming a ring structure. Toward the bottom left and right of the ring are filaments of gas spiraling inward toward the core. At the top left of the ring is a noticeable gap, bordered by two large, blue pockets of dust and gas. The smaller galaxy is made of hazy, light blue gas and dust. Many red, green, blue, and yellow galaxies are spread throughout, with some being hazier in composition and others having more defined spiral patterns.

A pair of interacting galaxies. The larger of the two is slightly right of center. It is a one-armed spiral galaxy with a hazy, bright, white center and a ring of blue, gaseous filaments. The center of this galaxy shows JWST’s eight-pronged diffraction pattern. The single spiral arm begins at about the 7 o'clock position and spirals counterclockwise to the 12 o'clock position, forming a ring structure. Toward the bottom left and right of the ring are filaments of gas spiraling inward toward the core. At the top left of the ring is a noticeable gap, bordered by two large, blue pockets of dust and gas. The smaller galaxy is made of hazy, light blue gas and dust. Many red, green, blue, and yellow galaxies are spread throughout, with some being hazier in composition and others having more defined spiral patterns.

JWST MIRI image of Arp 107, also known as UGC 5984.

In this pair of interacting galaxies, only the one-armed spiral glows brightly in mid-infrared light. Young, forming stars surrounded by dusty silicates and soot-like molecules glow in blue.

Credit: NASA, ESA, CSA, STSc
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28.07.2025 00:31 — 👍 32    🔁 2    💬 1    📌 0
A pair of interacting galaxies. The galaxy on the left is seen edge-on. It has a bright yellow central core and a slightly warped blue disk that is dotted with star clusters and clumps of dark dust. The edge of the disk arcs to the right, appearing to connect to its companion galaxy. The second galaxy is inclined, but seen closer to face-on. It has a central bar of blue-ish stars that is largely obscured by a haze of yellow stars and dust lanes in the circular core of the galaxy. Two spiral arms emerge from the core, which are wide, poorly defined, and mostly made of yellow older stars, which is unusual for a spiral galaxy.

A pair of interacting galaxies. The galaxy on the left is seen edge-on. It has a bright yellow central core and a slightly warped blue disk that is dotted with star clusters and clumps of dark dust. The edge of the disk arcs to the right, appearing to connect to its companion galaxy. The second galaxy is inclined, but seen closer to face-on. It has a central bar of blue-ish stars that is largely obscured by a haze of yellow stars and dust lanes in the circular core of the galaxy. Two spiral arms emerge from the core, which are wide, poorly defined, and mostly made of yellow older stars, which is unusual for a spiral galaxy.

Hubble image of Arp 283, also known as NGC 2798 and NGC 2799.

The left galaxy in this interacting pair, NGC 2799, is viewed edge-on. A bridge with clumps of star formation appears to connect it to NGC 2798, at right.

Credit: ESA, NASA, SDSS, J. Dalcanton, J. Schmidt
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27.07.2025 12:32 — 👍 11    🔁 1    💬 0    📌 0

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