Check out this amazing video from Chris Pattison (@cosmochris.bsky.social) describing 4MOST and our First Light observations! #4MOST #astronomy #astrophysics #telescope #observatory

Meet the team commissioning 4MOST! Over the next two months, they’ll observe thousands of targets to study how the instrument performs and ensure it meets expectations ahead of full science operations. #4MOST #astronomy #astrophysics #telescope #observatory

4MOST in motion! Mounted on ESO’s VISTA telescope in Chile, this wide-field, fibre-fed spectroscopic facility can observe over 2000 targets at once, capturing their light and splitting it into spectra for analysis. Video: AIP/A. Saviauk Audio: LofCosmos #4MOST #astronomy #astrophysics

Congratulations to @4most-eu.bsky.social which has achieved First Light, splitting the light into 18,000 spellbinding colour components. 🎉 Read more about this multi-tasking telescope, which will collect the largest ever spectroscopic sample of supernovae. 🔭 tinyurl.com/2wnw86zd

When light from a star or galaxy enters one of 4MOST’s 2400 fibres, it is split into its colours and dispersed across the detectors, creating a spectrum, a detailed record of brightness versus wavelength. Credit: AIP/R. de Jong, CRAL/J.-K. Krogager #4MOST #astronomy #astrophysics

Meet the team! Image Credit: M. Gammel #4MOST #astronomy #astrophysics

Revolutionary new space telescope @4most-eu.bsky.social has captured its first data from the universe. Our scientists are part of the team behind the super-scope and say it’ll reveal how galaxies and black holes formed. Read more 👉 tr.ee/ba4NEs

Our PI, Roelof de Jong, reflects on 15 years of dedication, collaboration, and discovery leading to 4MOST First Light. Image Credit: R. de Jong #4MOST #Astronomy

1/ The 4MOST instrument installed on our VISTA telescope in Chile completed its first test observations. @4most-eu.bsky.social will help us unravel our galactic history, explore dark matter, and more. www.eso.org/public/annou... 🔭 🧪 #instrumentation 📷 AIP/A. Saviauk

First light for 4MOST! 🔭 Global telescope collaboration @4most-eu.bsky.social captures its first light, beginning a scientific journey to reveal how galaxies and stars form and evolve. Discover Durham’s role in this project 👉 www.durham.ac.uk/news-events/... @icc-durham.bsky.social

A new telescope facility is born 🌟, #4MOST captured its first starlight 💫 An impressive example of international cooperation. 4MOST can analyse the light from 2,400 objects simultaneously in 18,000 colours. www.aip.de/news/4most-f... @eso.org @4most-eu.bsky.social @aippotsdam.bsky.social

🤩The @4most-eu.bsky.social (#4MOST) facility on @eso.org VISTA telescope in Chile achieved first light. #MPE scientists played a leading role in developing the Operations System, enabling to link #eROSITA’s X-ray universe with large-scale structure of galaxies. ➡️ More: www.mpe.mpg.de/8102833/news...

First Light for 4MOST! The 4-metre Multi-Object Spectroscopic Telescope (4MOST) has captured its very first spectra! Video Credit: AIP/R. de Jong, AIP/K. Riebe, AIP/A. Saviauk, CRAL/J.-K. Krogager

Sneak peek time! 👀 Each dot in this image is a target star or galaxy that will be captured in our First Light! Soon, each of these dots will turn into spectra, revealing the chemical signature of each of these objects! Image Credit: R. de Jong #4MOST #astronomy #telescope #observatory #science

The glasses aren’t raised just yet… but they’re standing by. Preparations for 4MOST First Light are in full swing, and the team on the mountain clearly have everything ready for the big day! 🥂 📷: R. de Jong #4MOST #telescope #astronomy #astrophysics #science #observatory

The road has been winding, but the destination is now in sight! 4MOST is almost at first light! Stay tuned 👀 📷: F. Laurent #4MOST #telescope #astronomy #astrophysics #science #observatory

3/3: The nine 4MOST Extragalactic Community Surveys explore the Universe beyond the Milky Way. Together they will probe galaxy evolution, the baryon cycle, strong lensing, quasar feedback, and the large-scale structure of the cosmos! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic

2/3: The nine 4MOST Extragalactic Community Surveys explore the Universe beyond the Milky Way. Together they will probe galaxy evolution, the baryon cycle, strong lensing, quasar feedback, and the large-scale structure of the cosmos! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic

1/3: The nine 4MOST Extragalactic Community Surveys explore the Universe beyond the Milky Way. Together they will probe galaxy evolution, the baryon cycle, strong lensing, quasar feedback, and the large-scale structure of the cosmos! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic

2/2: The 4MOST Galactic Community Surveys tackle some of the biggest questions in stellar and galactic astrophysics. From newborn stars to ancient remnants, these surveys will measure ages, motions and chemistry across all components of our galaxy! 📷: A Saviauk/AIP #WorldSpaceWeek #4MOST #milkyway

1/2: The 4MOST Galactic Community Surveys tackle some of the biggest questions in stellar and galactic astrophysics. From newborn stars to ancient remnants, these surveys will measure ages, motions and chemistry across all components of our galaxy! 📷: A Saviauk/AIP #WorldSpaceWeek #4MOST #milkyway

✨Studying the changing universe✨ From exploding stars to supermassive black holes, TiDES will capture transients and their host galaxies to map cosmic evolution! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic #telescope #astronomy #astrophysics #science #observatory

✨1001MC: Unlocking the Magellanic Clouds✨ 1001MC will map the history and interactions of our closest neighbours with high-quality spectra! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #magellanicclouds #extragalactic #telescope #astronomy #astrophysics #science #observatory

✨Mapping clustering from the nearby to distant universe✨ The Cosmology Redshift Survey will trace cosmic structure using 8 million galaxies and quasars! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic #telescope #astronomy #astrophysics #science #observatory

✨A formidable high-resolution view of the Milky Way✨ 4MIDABLE-HR will uncover the story of our galaxy’s evolution! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #milkyway #telescope #astronomy #astrophysics #science #observatory

✨Tracing the growth of galaxies✨ From galaxy bulges to cosmic filaments, WAVES will map 1.6 million galaxies to reveal how structure, mass, and energy assemble across the universe! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic #telescope #astronomy #astrophysics #science #observatory

✨A formidable survey of the Milky Way✨ 4MIDABLE-LR will unravel the history of our galaxy by studying the motions and structures of stars in its bulge and disk! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #milkyway #telescope #astronomy #astrophysics #science #observatory

✨Active Galactic Nuclei across the Universe✨ The AGN Survey will reveal how supermassive black holes at the centre of galaxies grow and shape the evolution of their host galaxies! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic #telescope #astronomy #astrophysics #science #observatory

✨Unlocking our galaxy’s chemical past✨ The Milky Way Halo High Resolution Survey will map 1.5 million stars in detail, including the largest sample of metal poor stars to date! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #milkyway #telescope #astronomy #astrophysics #science #observatory

✨Galaxy Clusters in Detail✨ The Galaxy Clusters Survey will study 40,000 galaxy clusters, from nearby groups to distant giants! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #extragalactic #telescope #astronomy #astrophysics #science #observatory

✨Mapping the Milky Way’s Halo✨ The Milky Way Halo Low Resolution Survey will combine Gaia and 4MOST data to reveal how our galaxy was formed! 📷: A. Saviauk/AIP #WorldSpaceWeek #4MOST #milkyway #telescope #astronomy #astrophysics #science #observatory

Join the 4MOST collaboration in celebrating World Space Week! 🔭 📷: A. Saviauk/AIP #worldspaceweek #4most #telescope #astronomy #astrophysics #science #observatory

Get to know the people working in the UK to make the @vrubinobs.bsky.social LSST happen. We caught up with @cfrohmaier.bsky.social to find out more about his work with @4most-eu.bsky.social TiDES and what he's looking forward to most about the Rubin survey 🔭 www.lsst.ac.uk/news/2025-09...

Between busy nights, our systems verification crew have had some time to explore Cerro Paranal! It is from this mountain that 4MOST will operate, observing 2400 objects at a time ✨🔭 📷: M. Cunningham #4most #ESO #telescope #astronomy #astrophysics #science #universe #paranal #observatory

Welcome to the official 4-metre Multi-Object Spectroscopic Telescope (4MOST) Bluesky account! Stay tuned for our first-light events coming very soon, and updates on all of the amazing science we will be completing over the years to come! 📷: Y. Beletsky/ESO #4most #ESO #telescope #astronomy

Spot a logo that gives off superhero vibes? 😉 Meet "Fantastic 4MOST", which will soon join our league of extraordinary instruments. @4most-eu.bsky.social comes packed with superpowers. Discover them: www.eso.org/public/image... 📷 ESO/4MOST/Steffen Frey 🔭 🧪 #instrumentation