Matthias Rauls (@dobsonaut) — Bluesky Profile

2 days ago

Gibt es bessere Abbildungen? Oder: gibt es überhaupt einem menschlichen Gehirn vermittelbare Ideen, wie es hinter dem Ereignishorizont weitergeht?

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1 week ago

What an enviable experience!
What is the reason, btw, that we don't here more often from early results e.g. number of supernovae detected etc. Is it because the "results" only would come from "the other end" of the alert pipeline?

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1 month ago

Thanks - but my brain starts spinning ... (or is it expanding?)

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1 month ago

Wouldn't the "galaxies move through space" argument quickly 'collide' with the speed limits of relativity?

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2 months ago

This maps neglects the long history of making excellent wines in many European regions before 1960, German Riesling being only one among many.

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2 months ago

This illustration is not appropriate. No question about it. Without wishing to defend the authors, I could imagine that the extremely rapid rotation of the asteroid gave rise to the idea of it having a more solid structure and less being of the rubble heap type.

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2 months ago

This image shows the location of Cloud-9, which is 14 million light-years from Earth. The diffuse magenta is radio data from the ground-based Very Large Array (VLA) showing the presence of the cloud. The dashed circle marks the peak of radio emission,which is where researchers focused their search for stars. Follow-up observations by the NASA/ESA Hubble Space Telescope’s Advanced Camera for Surveys found no stars within the cloud. The few objects that appear within its boundaries are background galaxies. Before the Hubble observations, scientists could argue that Cloud-9 is a faint dwarf galaxy whose stars could not be seen with ground-based telescopes due to the lack of sensitivity. Hubble’s Advanced Camera for Surveys shows that, in reality, the failed galaxy contains no stars.

The universe is still full of surprises! This is Cloud-9, a starless blob held together by dark matter--a "failed galaxy."

Astronomers have long speculated that such hidden objects formed the building blocks of bright galaxies like our own. Now we've found one. 🧪🔭

esahubble.org/news/heic2601/

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2 months ago

Lovely!

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2 months ago

Cold Self-Lubrication of Sliding Ice The low kinetic friction between ice and numerous counterbodies is commonly attributed to an interfacial water layer, which is believed to originate from preexisting surface water or from melt water i...

I enjoyed reading your summary on the physics of skating. I remembered, however, that 40y ago I was told in Chemical Physics, that transient pressure on ice can not suffice to melt it. May I bring to your attention this recent MD study on an interesting alternative? journals.aps.org/prl/abstract...

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3 months ago

Thanks!

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3 months ago

A yellowish shining spiral galaxy with dark brownish dust bands and blueish groups of young hot stars.

M31 is our neighbor in the ocean of the universe. I recently showed that my telescope can detect individual stars 2.5Mio LY away. Imaging the entire galaxy with the same telescope is more difficult. This #astrophotography with my #CelestonOrigin is a mosaic from 6 images, each 1h of exposure time.

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3 months ago

What a beautiful, instructive visualization (and it is still even if people dispute the one or the other color shade by 10.000y).

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4 months ago

Is there a higher resolution version of this map available?

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4 months ago

There seems to be a bad link attached!? But gorgeous image!!

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4 months ago

Great visualization!

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4 months ago

[V3cam] Kīlauea volcano, Hawaii (south Halemaʻumaʻu crater) YouTube video by USGS

Have you yet seen two lava fountains close to each other? Check this live cam from Kilauea:
www.youtube.com/live/BqmpkUd...

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5 months ago

Today, that star marked with "Var!" can be imaged with a 6 inch telescope: bsky.app/profile/dobs...

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5 months ago

But the point you are making is interesting, though!

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5 months ago

I am sure that you are using the word lie as a rethoric hyperbole here. To me, it's just our eyes (and monitors) that are incapable of displaying and recognizing exponential brightness profiles.

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5 months ago

A black and white photo of Albert Einstein, around age 25, sitting at a desk. He is a wearing a flannel suit and resting his right arm on the desk. Einstein is looking to the left of the photographer in this posed photo.

The first paragraph of the paper, in German. Translated to English is reads:

It is known that Maxwell's electrodynamics—as usually understood at the present time—when applied to moving bodies, leads to asymmetries which do not appear to be inherent in the phenomena. Take, for example, the reciprocal electrodynamic action of a magnet and a conductor. The observable phenomenon here depends only on the relative motion of the conductor and the magnet, whereas the customary view draws a sharp distinction between the two cases in which either the one or the other of these bodies is in motion. For if the magnet is in motion and the conductor at rest, there arises in the neighbourhood of the magnet an electric field with a certain definite energy, producing a current at the places where parts of the conductor are situated. But if the magnet is stationary and the conductor in motion, no electric field arises in the neighbourhood of the magnet...

Happy 120th birthday, special relativity!

Albert Einstein introduced special relativity in the paper "On The Electrodynamics Of Moving Bodies," published in Annalen der Physik #OTD in 1905. 🧪 ⚛️ 🔭

Manuscript: onlinelibrary.wiley.com/doi/abs/10.1...
English: www.fourmilab.ch/etexts/einst...

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5 months ago

Interesting! The word "kwaksalver" also is equivalent to the old German word for the element mercury, whick is "Quecksilber". So this could be someone who prepares mercury containing ointments which must have been quite common then.

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5 months ago

Blue-white wisps of a galactic nebula against the backdrop of countless stars in the summer Milky Way.

A close-up of the blue-white wisps of the Eastern Veil nebula against the backdrop of countless stars in the summer Milky Way.

Constellation Cygnus hides a marvel of galactic nebulae. The Eastern Veil Nebula is part of a much larger remnant of a supernova that exploded around 8,000 years ago. This #astrophotography was created as a mosaic of two images taken with my #CelestronOrigin, each with an exposure time of one hour.

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5 months ago

That person in the '70s is exactly me!

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5 months ago

The yellowish tone of old stars in the center of the Andromeda galaxy contrasts with the blue from groups of hot young stars, dark dust lanes and a few small magenta blobs from ionized hydrogen clouds. The image was exposed for around 2 hours with a 6 inch Celestron Origin telescope.

In the midst of a featureless star cloud in the Andromeda galaxy, a single star is highlghted. This variable "Cepheid" star was discovered in 1923 by Edwin Hubble on photographic plates with the 2.5m Hooker telescope on Mt. Wilson. Today, a 6 inch Celestron Origin Intelligent Home observatory can image that star quite easily.

"The star that changed the size of the universe" was discovered in 1923 by Hubble on a plate taken with the 2.5m Hooker telescope. This variable Cepheid star proved that Andromeda is a far away galaxy like our own. Today, #astrophotography with my little #CelestronOrigin can show this star clearly.

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6 months ago

Congratulations on that phantastic journey!

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6 months ago

Sehr interessante Seite, danke! Vor allem, da ich mich da altersgemäß (und damit vorteilhaft!) einordnen kann.

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6 months ago

$This well-composed telescopic field of view covers over a Full Moon on the sky toward the high-flying constellation Pegasus. Of course the brighter stars show diffraction spikes, the commonly seen effect of internal supports in reflecting telescopes, and lie well within our own Milky Way galaxy. The faint but pervasive clouds of interstellar dust ride above the galactic plane and dimly reflect the Milky Way's starlight. Known as galactic cirrus or integrated flux nebulae they are associated with the Milky Way's molecular clouds. In fact, the diffuse cloud cataloged as MBM 54, less than a thousand light-years distant, fills the scene. The galaxy seemingly tangled in the dusty cloud is the striking spiral galaxy NGC 7497. It's some 60 million light-years away, though. Seen almost edge-on near the center of the field, NGC 7497's own spiral arms and dust lanes echo the colors of stars and dust in our own Milky Way.$

Galaxies, Stars, and Dust

#astronomy #astrophotography #apod

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6 months ago

The contrasting spiral arms of a galaxy, with old stars in yellow, young and hot groups of stars in blue and some tiny specs of magenta for glowing hydrogen gas.

The star that expanded the universe was discovered by Edwin Hubble in 1923 with a 2.5m telescope. The Cepheid star V1 gave first prove that Andromeda is a galaxy outside our milkyway. Today, this #Astrophotography with my little #CelestronOrigin clearly shows this star in the gorgeous spiral of M31.

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6 months ago

35 Philosophical Concepts That Don't Exist in English (But Totally Should)
1-10: Concepts About Self & Identity
• Ubuntu (Zulu/Xhosa) - "I am because we
• Shinrin-yoku
(Japanese)
"Forest
are"; the idea that our humanity is shaped
bathing"; a meditative appreciation of nature.
through community.
• Lagom
• Tatemae &
Honne
(Japanese) - The
(Swedish) - Not too much, not
too little - just the right amount.
contrast between a person's public face • Kalpa (Sanskrit) - A cosmic unit of time; (tatemae) and their true feelings (honne).
often
used in Hindu and Buddhist
• Janteloven (Scandinavian) - The cultural cosmology.
belief that no one is better than anyone • Memento mori (Latin) - "Remember you else; humility over individualism.
• Ikigai (Japanese) - Your reason for being;
must die"; a reflection on mortality and the value of life.
the intersection of passion, mission, $ 21-30: Emotions, Relationships & Human vocation, and profession.
Nature
• Duende (Spanish) - A mysterious, soul-stirring emotional
• Kaukokaipuu (Finnish) - A longing for
power,
often
distant places you've never been.
experienced through art or music.
• Kintsugi (Japanese) - The art of repairing * Jayus (Indonesian) - A joke so badly told
that it becomes funny again.
broken pottery with gold, symbolizing • Mamihlapinatapai (Yaghan) - The look beauty in imperfection and healing
shared by two people who want to act
• Zanshin (Japanese) - A state of relaxed
but hesitate.
alertness
and
focused awareness, • Forelsket (Norwegian) - The euphoria of
especially in martial arts.
falling in love.
• Gezelligheid (Dutch) - The warm,
collective comfort of being with loved • Humorebi (Japanese) - The sunlight that
filters through the leaves of trees.
ones.
• Mokita (Kivila, Papua New Guinea) - The
• Wabi-sabi (Japanese) - A
worldview
truth everyone knows but no one says.
centered on accepting transience and • Ya'aburnee (Arabic) - Literally "you bury imperfect beauty.
me"; a declaration that life without the
• Sprezzat…

As an antidote to the constantly dreadful news, have some philosophical concepts:

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6 months ago

About 8,000 years ago, a star exploded in the constellation Cygnus. Today, we can observe the faint remnants of this supernova as the "Veil Nebula". This astrophotography was composed of two 1h exposures taken with my @celestronuniverse.bsky.social‬ Origin telescope and developed in #Pixinsight.

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