Andrey Kravtsov

A starburst shines in infrared A starburst shines in infrared

esawebb.org/images/potm2...

I also think that most of the atoms in our bodies (definitely, oxygen, carbon, etc.) were inside stars in the past, and actually not one, but several different stars.

Here is a mid-infrared image of the same galaxy. The emission in this image is produced by the warm dust and polycyclic aromatic hydrocarbons (PAHs).

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A new fantastic image of M82 by JWST NIRCam, showing a biconical outflow of gas and dust from this starbursting galaxy.

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esawebb.org/images/potm2...

I have completed my contributions to this field thank you

Photo or a slide with numbers of staff, publications etc.

And here a lovely overview of #ArXiv statistics from Ralph Wijers.

#astrodon #OpenScience #eas2025

Want to instead explore the Virgo Cluster as captured by Rubin at full resolution? Head to our Skyviewer and enjoy some cosmic joyscrolling! There's so much to explore and discover ✨ #RubinFirstLook #CaptureTheCosmos 🔭🧪

➡️ skyviewer.app

In case you've been contemplating moving elsewhere in our Galaxy...

bsky.app/profile/phdc...

A three-panel image, two at the top, and one stretched across the bottom. At top left, two spiral galaxies are widely separated against the black background of space. At top right, two face-on spiral galaxies are close together. Their spiral arms appear stretched toward each other. At bottom, two spiral galaxies have collided, resulting in a broad X-shaped patch of milky white. Mottled clouds of dark brown dust are superimposed.

NEW: Astronomers used Hubble to re-examined the prediction that the Milky Way galaxy will eventually collide with the Andromeda galaxy. They find there is only a fifty-fifty chance the two galaxies will smash together within the next 10 billion years: bit.ly/3YzymOx 🔭 🧪

Courtesy of @karpathy.bsky.social

The science paper publication industry gives millions in revenues to the publishers, but is created for free by the experts. The value-add of publication (what people pay for) is much less than that of peer-review and editorial (which they don't).

It is ripe for disruption. Hopefully like this.

A Cosmic Miracle: A Remarkably Luminous Galaxy at $z_{\rm{spec}}=14.44$ Confirmed with JWST JWST has revealed a stunning population of bright galaxies at surprisingly early epochs, $z>10$, where few such sources were expected. Here we present the most distant example of this class yet -- MoM...

This may not be obvious, but a paper like the Naidu et al on the new distance record holder galaxy
arxiv.org/abs/2505.11263
would normally be submitted to Nature. The fact that it was submitted to the @ojastro.bsky.social signals a major shift in the field.

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A galaxy at redshift z=14.44? This morning's arXiv mailing presented me with a distraction from examination marking in the form of a paper by Naidu et al. with this abstract: This paper has been submitted to the Open Journal of Astrophysics. I usually feel a bit conflicted in situations when a paper has been submitted for editorial review. I am posting it here for two reasons: one is that I am not the Editor responsible for this paper; the other is that the…

A galaxy at redshift z=14.44?

This morning's arXiv mailing presented me with a distraction from examination marking in the form of a paper by Naidu et al. with this abstract: This paper has been submitted to the Open Journal of Astrophysics. I usually feel a bit conflicted in situations when a…

not yet sure whether this is useful at all, but an interesting concept: each arXiv paper is a star and the nearest stars are papers on related topics:
soarxiv.org
It only has papers up to April 2025 rn (if you lose your cursor, hit Esc to recover it).

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A google map with a path through the state of Illinois with 7 towns with the same names as major European cities (Paris, Vienna, Athens, Berlin, Rome, Milan, Geneva, IL).

If your next European adventure does not pan out, Illinois has alternatives to offer...

This is a general audience deep dive into the Large Language Model (LLM) AI technology that powers ChatGPT and related products. It is covers the full traini... Deep Dive into LLMs like ChatGPT

Andrej Karpathy: Deep Dive into LLMs Like ChatGPT [video] Discussion

Happy Sunday blue sky! 3 GitHub Repos to learn more about #AI and #ML

1. Neural Networks: Zero to Hero from Andrej Karpathy.
lnkd.in/erA-Gerp

2. Machine Learning Andrew Ng’s lectures
lnkd.in/ebtWemWD

3. Deep Learning Specialization - Andrew Ng’s lectures & practice problems
lnkd.in/e2RECCSQ

INTRODUCTION

Modern-Day Oracles or Bullshit Machines?

Jevin West (@jevinwest.bsky.social) and I have spent the last eight months developing the course on large language models (LLMs) that we think every college freshman needs to take.

thebullshitmachines.com

The authors of the quoted paper showed that if the transition to the true vacuum state occurs the Universe will collapse into black hole...

Frontiers | Cosmological Aspects of Higgs Vacuum Metastability The current central experimental values of the parameters of the Standard Model give rise to a striking conclusion: metastability of the electroweak vacuum i...

Experimental measurement of the Higgs boson mass indicates that it is likely to be in the metastable false vacuum.
www.frontiersin.org/journals/ast...

A quote from Coleman & De Luccia (1980) paper about how their result that the transition of the Higgs field to its true vacuum state will collapse will end all hope for our Universe.

A reminder from @astrokatie.com at the end of her "Picture an Astronomer" talk at UChicago tonight that no matter what you see in the news, things can get MUCH worse if the Higgs field tunnels to its true vacuum state... 🧪🔭

If our kick-off celebration (incl. a talk from @highzclouds.bsky.social) on Jan. 30 isn't sufficient diversion, come hear Dara Norman talk about global scale astronomy from the Windy City on Feb. 3!

Free for the public in person and also streamed online!

More at pictureanastronomer.github.io

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New Publication at the Open Journal of Astrophysics: "On the universality of star formation efficiency in galaxies" by Ava Polzin & Andrey V. Kravtsov (U. Chicago) and Vadim A. Semenov & Nickolay Y. Gnedin (CfA Harvard), all based in the USA

astro.theoj.org/article/1270...

Visualization of the Milky Way based on the current data from the Gaia space mission that took its last data today.

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(10+(9+8*7)*6)*5 + 4*3*2 +1 = 2025

Best wishes for 2025 everyone! 🧪

Evolution of the programming languages use in astronomy research

From Yuan-Sen Ting on X. Evolution of the programming languages use in astronomy research.

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I've contributed...

astro.theoj.org/article/1274...

I'm generally apathetic towards AI. When I participated in user studies of this tool, I could maybe finally see a way that it could help astronomers do research. Awesome work by Iyer et al, including @jwuphysics.bsky.social, @jegpeek.bsky.social. 🔭🧪

ui.adsabs.harvard.edu/abs/2024ApJS...

Extrapolation of the Open Journal of Astrophysics

This morning I published another paper at the Open Journal of Astrophysics, taking the total number of publications for this year to 115 and the total altogether to 230. This means that we have now published as many papers this year as we have in…

infrared image of merging galaxies IC 2163 and NGC 2207 by the MIRI instrument on the James Webb Space Telescope

Intergalactic salsa dance anyone?

This is an infrared image of merging galaxies IC 2163 and NGC 2207 by the MIRI instrument on the James Webb Space Telescope. If you wonder why it looks different than typical images of galaxies, this is because this image shows dust particles and dense gas.