Pittsburgh's cathedral of learning has switched on the batsignal to gather all the world's cosmologists ahead of next week's conference.

One especially nice result from @swiftsimulation.bsky.social -based simulations run by students attending the Ex-Gal galaxy simulation summer school in Durham last week.

Sometimes, we have to go to the computer room and push the bytes around in the machine by hand.

📢Leiden Institute of Physics (LION) is #hiring a faculty member in experimental quantum physics (tenure-track, Asst. Prof. level, higher possible). Join us in exploring the limits of #quantummechanics! Apply by Oct 5, 2025 👉 edu.nl/hyt88

Spending the day at LJMU for the 5 year anniversary of their computing centre. The conference room alone is worth the trip.

The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out! This is the culmination of years of work by a large team. The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations. (Sound on!)

The sophisticated COLIBRE simulations finally land on the arXiv: arxiv.org/abs/2508.21126. Treating these with sonification, we can get new intuition for galaxy evolution to augment our visuals. Sound on for the explainer vid, visit the site for more! colibre.strw.leidenuniv.nl/videos.html 🔭🧪

The first paper (arxiv.org/abs/2508.21126) presenting our new set of galaxy formation simulations is now out! This is the culmination of years of work by a large team. The COLIBRE project will hopefully be a new milestone in the physics included in large-scale galaxy simulations. (Sound on!)

A bit of astrophotography with a 6-months long single exposure over Randogne, Switzerland showing the path of the Sun over the Alps. @solarcan.bsky.social

A bit of astrophotography with a 6-months long single exposure over Randogne, Switzerland showing the path of the Sun over the Alps. @solarcan.bsky.social

Über 150 internationale Wissenschaftlerinnen und Wissenschaftler diskutieren diese Woche am AIP beim 18. Potsdamer Thinkshop. Der Thinkshop mit dem Titel „The Role of Feedback in Galaxy Formation“ bietet Raum für neue Ideen und interdisziplinäre Zusammenarbeit. 💫 #astrophysics #galaxy #potsdam

Take a whistle stop tour of @esa.int’s Euclid mission exhibit at this year’s GoodWood #FestivalOfSpeed with James, an Outreach Co-ordinator at The University of Edinburgh… (1/6) 🧵

@runningastronomer.bsky.social gets the universe back on track for day 3 at the Goodwood festival of speed

The universe is in progress

We ran a randomized controlled trial to see how much AI coding tools speed up experienced open-source developers. The results surprised us: Developers thought they were 20% faster with AI tools, but they were actually 19% slower when they had access to AI than when they didn't.

UK astronaut Tim Peake is being introduced to the mysteries of the Universe via our @swiftsimulation.bsky.social code running a live simulation

Let's go!

Being rude is how we defeat the machines

Adding the word ‘fucking’ to your Google search query disables the unwanted AI summary at the top of the results page.

Simulated galaxies from the new model are 🤩🤩

Seminar today at the Oskar Klein Center in Stockholm

Utrecht physics theory group consumes enough pizza that they have dedicated garbage bins

⚡️Are you into stellar streams, galaxies and dark matter? We’re offering a JAE Intro 2025 #research #scholarship at @ifca.es 🔍 Topic: Analysis of stellar streams 📍 Location: Santander, Spain ⏳ Duration: 7 months 💶 Grant: 600 €/month 🔗 goo.su/nsUJk @csic.es @csicdivulga.bsky.social

New paper on the arXiv based on our cosmological simulation work! Link: arxiv.org/abs/2504.15633 We use the flamingo runs to construct a simple analytic expression for the baryon correction to the matter power spectrum. Having a quick, but accurate enough, estimate is key for the analysis of data

New paper on the arXiv based on our cosmological simulation work! Link: arxiv.org/abs/2504.15633 We use the flamingo runs to construct a simple analytic expression for the baryon correction to the matter power spectrum. Having a quick, but accurate enough, estimate is key for the analysis of data

Happy 4th once-in-a-generation-financial-crisis to those who celebrate.

Happy 4th once-in-a-generation-financial-crisis to those who celebrate.

Spring is here.

That' as much as we'll get here

🥳 It's paper day for the completed #ESO Kilo-Degree Survey. We end our journey with a consistent picture of #cosmology 😲 I've been co-leading KiDS for 12yrs & I'm so proud of what the team's achieved. If you're at the #Euclid meet, go to Angus Wright's talk @10am today!🔭 ℹ️: arxiv.org/pdf/2503.19441

New career development opportunity

I am looking for a PhD student to work on beyond 2-point statistics for galaxy clustering & weak lensing as part of my Grant "Probing cosmic large-scale structure beyond the average" Details: uni-bielefeld.hr4you.org/job/view/417... Please share in your networks and encourage candidates to apply!

📢 We're hiring! 📢 In the context of our ENW-XL grant 'The Full Potential of the Higgs' we have 3 open PhD positions in our ATLAS group at Nikhef on the exciting search for double-Higgs production in the LHC Run-3 data! ➡️ jobs.nikhef.nl/jobs/3-phd-p... @nikhef.bsky.social

Spring is here

PSA: when a collaboration whose name starts with DE says they have found evidence for non-standard dark energy, the community should take that interpretation with more skepticism. DESI does not show that w0wa explains there data. Eg neutrino mass remains negative even with w0wa

It's #Euclid data release day! @esa.int and the Euclid Consortium are making 63 deg² of Wide Survey data available to the world. Imaging and spectroscopy data, catalogues and masks for 20+ million galaxies, quasars, stars and substellar objects. #astronomy #science #space 1/4

Q1 Day – Euclid’s First ‘Quick’ Data Release Today is Q1 Day! This means the first public release of data from the full Euclid Survey. It's only a very small portion (0.4%) of the survey - just 63 square degrees on the sky, while the full survey will be over 14,000 square degrees - but in contrast…

Beautiful sunset over the Sidney harbour bridge and Opera house tonight. Or almost.

Wasabi: the classic Irish condiment

Virtual galaxy from our new model 🤩

Virtual galaxy from our new model 🤩

This is excellent

Leiden vandaag.

Graduation time for our master students at Leiden Observatory!

Ladies & Gentlemen, The Universe:

New office decoration just arrived! A map of the underlying cosmology model of our Universe with unprecedented level of details. (Simulation image generated by @jborrow.bsky.social based on our @swiftsimulation.bsky.social run with >10^12 resolution elements)

Our fully-funded @api.uva.nl ASPIRE summer programme for MSc students is now open for applications! Deadline March 10. ASPIRE is aimed at students from under-represented groups, especially from countries where opportunities for research experience are scarce. 🔭 Please share! aspire.science.uva.nl

Applications to the IAYC 2025 are now open! If you’re 16-24 years old and interested in astronomy, join us for an unforgettable 3 weeks of stargazing, outdoor adventures, and hands-on projects. Check out our First Info page to apply: www.iayc.org/nextcamp/. Applications close March 9, 23:59 CEST

I look forward to starting my Disney Pocahontas era in a few years when the raccoons reach the netherlands

KM3NeT xkcd.com/3053