ESO<p>When your mirror gets dirty at home, you can just grab a cloth and some spray to clean it. But what about the ultra-precise, reflective mirrors of telescopes? 🤔</p><p>Things can get a bit more complex. This image shows you part of the cleaning process for the main mirror of the ESO 3.6-metre Telescope at La Silla Observatory, <a href="https://astrodon.social/tags/Chile" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>Chile</span></a>.</p><p>Discover how it's done: <a href="https://www.eso.org/public/images/potw2524a/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">eso.org/public/images/potw2524</span><span class="invisible">a/</span></a></p><p>Do you want to learn more about how we clean telescope mirrors? Then check out this blog post: <a href="https://www.eso.org/public/blog/exploding-snow/" rel="nofollow noopener" translate="no" target="_blank"><span class="invisible">https://www.</span><span class="ellipsis">eso.org/public/blog/exploding-</span><span class="invisible">snow/</span></a></p><p>📷 A. Silber/ESO</p><p><a href="https://astrodon.social/tags/astrodon" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrodon</span></a> <a href="https://astrodon.social/tags/astronomy" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astronomy</span></a> <a href="https://astrodon.social/tags/astrophysics" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>astrophysics</span></a> <a href="https://astrodon.social/tags/space" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>space</span></a> <a href="https://astrodon.social/tags/science" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>science</span></a></p>
#Astrodon
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Astronomers may have found evidence of still-forming planets hidden somewhere in this close-up of the star RIK 113, taken with our Veery Large Telescope in #Chile
This and previous data taken with the Atacama Large Millimeter/submillimeter Array suggest that the disc around the star may be shaped by hidden planets.
The data show the presence of gaps and spiral features, which may have been caused by forming planets.
Learn more: https://www.eso.org/public/images/potw2523a/
ESO/C. Ginski et al.
This photo is insane. Dude went to Alaska to capture the #eclipse and the Northern Lights appeared behind it.
(Source: https://www.instagram.com/p/DHTysJtvv4Q/?igsh=YzZ0aWMxYjlzaWF4)
#Introduction Hi #fediverse ! We’re the European Southern Observatory, and we design, build and operate ground-based telescopes.
One of them is our Extremely Large Telescope, currently under construction in #Chile. It will have a 39 m mirror, and its rotating enclosure will weigh 6100 tonnes, or about 700 mastodons!
We’re looking forward to chatting with all of you about #astronomy
ESO/G. Vecchia
Many years ago I registered the astro-ph.co domain because it got turned into a link by various email clients (and even PDF readers) - and I thought it would be useful if rather than dumping you at a "no such domain" error page or a search engine result page, it actually took you to the relevant arXiv page. I never got around to doing more than a simple redirect to https://arxiv.org/list/astro-ph.CO/recent but I hope that's been better than nothing.
Anyway, I've now renewed it for one more year, and because .co domains are relatively expensive and I can't even really remember the problem I was trying to solve with this, I'm going to let it lapse in September 2025. In the meantime, if anyone has any responsible ideas for what to do with this and wants to take it over, let me know.
I'll probably boost/repost about this a few times before the time runs out.
arxiv.orgCosmology and Nongalactic Astrophysics
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The evidence comes from the fact, that both black holes, M 87*, and the one in the Galactic center show very similar polarization structure. M87 has a powerful jet, and the polarization is indicative of strong ordered magnetic field such as those you would expect at the base of a jet and at the inner edge of a heavily magnetized accretion flow. We can also fit the data with our numerical simulations of magnetized plasma, flows around black holes, and they naturally produce these jets. #astrodon
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BTW, 30 years ago, I proposed a model for the black hole in the center of the Milky Way saying that the radio mission can be explained by a hidden jet. This predicted the existence of radio light at the edge of the black hole and led to the prediction of a black hole shadow, that was observed two years ago by the EHT. The idea of a hidden jet remained controversial. It is exciting to see the tantalizing evidence coming from the #EHT polarization images, which supports the hypothesis. #astrodon
New!! Observations of our Event Horizon Telescope (#EHT) collaboration have uncovered strong & organized magnetic fields spiraling around the edge of the supermassive black hole Sagittarius A* (Sgr A*). Images in polarized light of the #blackhole in the Milky Way center reveal structures similar to those in M87*, suggesting that strong magnetic fields may be common to all black holes. This also hints toward a hidden jet in Sgr A*!
#astronomy #astrodon #scicomm #physics
SpaceX Starlink satellites photobombed my northern lights photos in Iceland!
Ein Interview mit mir in "Welt der Physik" - zu meinem Engagement gegen die #Klimakrise, zu meiner Wissenschaft und Vulkane werden auch kurz erwähnt :)
www.weltderphysik.de„Ich könnte es moralisch nicht vertreten, still zu sein.“Die Astrophysikerin Victoria Grinberg wagt sich an die extremsten Umgebungen im Universum – und setzt sich in ihrer Freizeit für die Klimabewegung „Astronomers for Planet Earth“ ein.
Morning.
Here it is, several thousand years in the making: the protostellar jet HH212 as seen in the infrared by #JWST.
We discovered this jet in 1993, glowing in the light of shocked molecular hydrogen at 2.12 microns, as gas emerges symmetrically at about 100 km/s from the two poles of a young protostar not far from the Horsehead Nebula in Orion.
Our new JWST image spans six wavelengths & is ten times sharper than any previous infrared image.
#Astronomy #SpaceScience #Astrodon
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Happy Halloween 
Here are the pumpkins I carved this year: An active red dwarf star and its gas giant planet. I call it an exo-pumpkin.
If you prefer to read things instead of listening (as do I myself; not an audio person ... 
), Physics World has now turned the podcast with me into a written interview:
https://physicsworld.com/a/victoria-grinberg-the-astrophysicist-sharing-her-love-for-science/
It's about my science, but also about all the things I do as a scientist that are not my science - climate crisis outreach and Astronomers for Planet Earth, my art and outreach in general.
Physics World has talked to me about my science and about all the things I do as a scientist that are not my science - climate activism and Astronomers for Planet Earth (@a4e), my art and outreach in general :)
If podcasts are your thing, you may like this one (also download able on all usual #podcast sources):
Want to know what my research is about? Follow this thread 
based on a 10min talk I've drawn for a meeting.
The talk was aimed at non-specialist space science colleagues (not the general public!). The slides were built up step by step, but I'm omitting this here & showing only the final graphs, less this becomes a 34-part thread. 11 is plenty enough!
So: "Understanding Winds of Massive Stars Using High Mass X-ray Binaries"
#astrodon #XraysAreTheBestRays #SciArt #scicomm #VicisAstro
1/11
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#ESA’s #Euclid mission launched today on a #SpaceX #Falcon9 rocket. The space telescope is headed to Sun-Earth L2, 1.5 million km from Earth, to survey the sky and uncover the mysteries of dark matter and dark energy. Below are actual launch and deployment photos.
For updates and more information, visit https://esa.int/euclid
Congratulations to the team that make up the #Euclid mission on their successful launch! We can't wait to see what mysteries of the dark universe this space telescope will uncover.
For updates and more information, visit the official Euclid website: https://www.esa.int/Science_Exploration/Space_Science/Euclid
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NANOGrav discovered evidence of gravitational waves from black holes billions of times the mass of the Sun. These waves are ripples in space-time, which is shown in this artist’s concept with stars, black holes, and nebula
More information:
• NASA JPL: https://www.jpl.nasa.gov/news/15-years-of-radio-data-reveals-evidence-of-spacetime-murmur
• Caltech: https://www.caltech.edu/about/news/scientists-find-evidence-for-slow-rolling-sea-of-gravitational-waves
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Using a colossal antenna formed by millisecond pulsars in our Milky Way galaxy, astronomers successfully identified low-frequency gravitational waves.
More information:
• NASA JPL: https://www.jpl.nasa.gov/news/15-years-of-radio-data-reveals-evidence-of-spacetime-murmur
• Caltech: https://www.caltech.edu/about/news/scientists-find-evidence-for-slow-rolling-sea-of-gravitational-waves
NASA Jet Propulsion Laboratory (JPL)15 Years of Radio Data Reveals Evidence of Space-Time MurmurScientists have found evidence of a universal background of gravitational waves, or ripples in the fabric of space-time.
#SpaceNews: For the first time, scientists have detected the gravitational wave background of the universe, marking a historic breakthrough.
More information:
• NASA JPL: https://www.jpl.nasa.gov/news/15-years-of-radio-data-reveals-evidence-of-spacetime-murmur
• Caltech: https://www.caltech.edu/about/news/scientists-find-evidence-for-slow-rolling-sea-of-gravitational-waves