Marc Postman's Avatar

Marc Postman

@astromarc.bsky.social

Astronomer studying galaxies, clusters, and dark matter. Envisioning the future of space astronomy. My posts are my own views. (he/him)

684 Followers  |  127 Following  |  123 Posts  |  Joined: 09.08.2023  |  2.1248

Latest posts by astromarc.bsky.social on Bluesky

A despicable new low. For the full text of the U.S. Constitution see constitutioncenter.org/the-constitu...

06.08.2025 15:50 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

For the morning crowd, here are all the observations stored in the Mikulski Archive for Space Telescopes. A visual created by Julie Imig, one of our amazing astronomical data scientists. Follow the link below for more colors and even a movie.

05.08.2025 11:49 β€” πŸ‘ 26    πŸ” 6    πŸ’¬ 0    πŸ“Œ 4
Post image

Yeah you're right. It gets kpc to meters correct and gets years to seconds correct but somehow cannot do kpc/year conversion to m/s correctly.

04.08.2025 19:35 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Don’t advertise these. Not useful.

25.07.2025 11:04 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

You identified the key attribute - β€œresponsible”. Sorely lacking in certain β€œleadership” positions.

23.07.2025 01:16 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
Ozzy Osbourne, pioneering heavy metal singer and Black Sabbath frontman, dies at 76 Word of Osbourne’s demise came weeks after the ailing front man reunited with his original Black Sabbath bandmates.

A legendary rocker is gone. www.nbcnews.com/news/obituar...

22.07.2025 18:30 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Does Pat Benatar count as punk?

20.07.2025 19:48 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

That’s my dad she’s referring to. 😊

19.07.2025 13:01 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Preview
One Survey by NASA’s Roman Could Unveil 100,000 Cosmic Explosions - NASA Scientists predict one of the major surveys by NASA’s upcoming Nancy Grace Roman Space Telescope may reveal around 100,000 celestial blasts, ranging from

Beautiful simulation of all the supernovae that the Nancy Grace Roman Space Telescope could detect in a single pointing, monitored for 3.5 years. Thousands of things do go bang in the night! See www.nasa.gov/missions/rom...

15.07.2025 20:29 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

MeerKAT proposals are due today, the only telescope on Earth capable of doing some of our science. This weekend our toddler gave us all a cold, AND decided sleep was overrated last night from 230-530am. Send help, or at least caffeine πŸ˜΅β€πŸ’«

πŸ”­πŸ§ͺ

14.07.2025 20:13 β€” πŸ‘ 21    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
A path through a green valley surrounded by mountains. A blue sky with a few white clouds highlights the clear weather when the photo was taken.

A path through a green valley surrounded by mountains. A blue sky with a few white clouds highlights the clear weather when the photo was taken.

A peaceful walk to work

09.07.2025 07:50 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
NASA’s Habitable Worlds Observatory Will Search for Life
YouTube video by NASA Goddard NASA’s Habitable Worlds Observatory Will Search for Life

Inspiring video about NASA's Flagship Mission for the next decade, the Habitable Worlds Observatory ... a true successor to the Hubble Space Telescope with the goal of measuring the likelihood of life on worlds beyond the Solar System and enabling revolutionary astrophysics!
youtu.be/XJwDlLiQpS4

09.07.2025 06:07 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Congratulations Sarah!

01.07.2025 21:31 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The first direct demo of interstellar navigation using stellar observations from a remote spacecraft. A real achievement for NASA and the New Horizons team. Current circumstances are limiting NASA led press coverage though. So please share!

30.06.2025 22:09 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The humbling part about that Sagan encounter was that he knew who my dad was but not me. πŸ˜„

13.06.2025 22:27 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

It’s my understanding that the CDC is now not recommending them. But if CDC removes recommending them then health insurance companies can decline paying for them. That’s a problem. And he also bypassed the independent advisory committee that is supposed to provide informed decisions on such things.

27.05.2025 22:18 β€” πŸ‘ 60    πŸ” 3    πŸ’¬ 1    πŸ“Œ 0
Post image

But nice rainbow afterwards.

16.05.2025 22:35 β€” πŸ‘ 7    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0

Apparently his ability leaves much to be desired.

04.05.2025 18:09 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Select all the boxes with traffic lights. 😁

25.04.2025 15:28 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
This Hubble image shows the moon Io passing above Jupiter's clouds. The black spot on the gas giant is Io's shadow.

This Hubble image shows the moon Io passing above Jupiter's clouds. The black spot on the gas giant is Io's shadow.

🧡
Continuing to celebrate Hubble's 35th anniversary, I share this captivating image of Jupiter and its volcanic moon Io.

It was released on 20 April 1999, together with others two, to commemorate the 9th anniversary of the launch.

Credit: J. Spencer (Lowell Observatory) & NASA/ESA

πŸ”­ πŸ§ͺ #Hubble35

24.04.2025 14:08 β€” πŸ‘ 143    πŸ” 22    πŸ’¬ 4    πŸ“Œ 2

Agree 100%

22.04.2025 01:25 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Post image

I can help.

18.04.2025 12:43 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Post image

Aldous was much closer to the mark than Orwell.

18.04.2025 12:37 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Good summary of major issues with the recent claims of β€œdetection” of biosignature gases on K2-18b.

18.04.2025 10:56 β€” πŸ‘ 6    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Happy Passover.

12.04.2025 19:11 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

This is not a new hubble image. It dates back to 2009. This was one of the last images taken with WFPC2.

11.04.2025 20:11 β€” πŸ‘ 10    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Forgetting history is what Booker was arguing against. Don’t forget Strom Thurmond but put him in his place as a force against human rights and a racist.

02.04.2025 15:52 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Overheard at the aquarium by a young kid looking at a large tank of tropical fish: β€œis this a screen or is it real?”

24.03.2025 01:05 β€” πŸ‘ 6    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Preview
The Distance to the Magellanic Stream: Constraints from Optical Absorption along Stellar Sightlines The Magellanic Stream (MS) is a large tail of neutral and ionized gas originating from tidal and hydrodynamical interactions between the Magellanic Clouds as they orbit the Milky Way (MW). It carries ...

Exciting first measurements by Sapna Mishra and collaborators of the distance to the Magellanic Stream using the VLT. Check it out. arxiv.org/abs/2503.14368

20.03.2025 00:42 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@astromarc is following 20 prominent accounts