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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 05/03/2026

Operations Rehearsal 4 (OpR4) has now concluded, marking a major milestone towards routine survey operations! Image: Automatically generated and queued OBs during OpR4 (Credit: Jakob Walcher) #4MOST #astronomy #astrophysics

A computer monitor showing the execution sequence scheduling interface at Paranal during OpR4

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 30/01/2026

After a successful commissioning process, 4MOST has reached the next major milestone before the full survey begins: Operations Rehearsal 4 (OpR4) ✨ Image: Carlos la Fuente launching the first observation for OpR4 (Credit: Jakob Walcher) #4MOST #astronomy #astrophysics

A picture of Carlos la Fuente launching the first observation for OpR4

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 21/12/2025

We are delighted to share that Dr Lara Cullinane has been awarded a prestigious Leibniz Junior Research Group based at the Leibniz Institute for Astrophysics Potsdam (@aippotsdam.bsky.social). Image Credit: AIP/Spikermann #4MOST #astronomy #astrophysics

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Leibniz-Gemeinschaft @leibniz-gemeinschaft.de · 12/12/2025

4MOST - Ein neuer Blick ins All. Matthias Steinmetz ( @galacticrave.bsky.social ) von @aippotsdam.bsky.social & @unipotsdam.bsky.social zu Gast bei #TonspurWissen, dem #Podcast von @leibniz-gemeinschaft.de & Rheinischer Post. 👁️🔭🌟 pod.fo/e/364503 #Astrophysik #Astronomie #4MOST @4most-eu.bsky.social

Rechts oben in der Ecke steht in einer weißen Blase "tonspur Wissen“. Am rechten Bildrand ist ein Foto von Matthias Steinmetz zu sehen. Er ist Direktor des Leibniz-Instituts für Astrophysik Potsdam. Das Bild der Person ist schwarz-weiß eingefärbt, um die Konturen der Person beschnitten und zusätzlich weiß umrandet. In einer großen weißen Blase, die mittig-links im Bild platziert ist, steht: "4MOST - Ein neuer Blick ins All. Matthias Steinmetz. Leibniz-Institut für Astrophysik Potsdam ". Der Bildhintergrund ist ein blau-grün eingefärbtes Foto eines Blick ins Weltall mit einer Spiralgalaxie und einem Messkurve.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 11/12/2025

Join Jessica Pilling from the University of Sussex for a day in her life commissioning the 4MOST instrument! Credit: J. Pilling #4MOST #astronomy #astrophysics #telescope #observatory 1. Arrival at Paranal observatory 🔭

A Paranal Observatory sign on the way to the observatory

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 19/11/2025

Commissioning is well underway at 4MOST! Sam Philipsborn, a PhD student from the University of Sussex, is one of the team members working tirelessly to ensure that 4MOST is performing as expected. Image Credit: S. Philipsborn #4MOST #astronomy #astrophysics #telescope #observatory

A view of mountains at Paranal, with the 4MOST facility visible on one of the peaks.

Sam Philipsborn standing next to the 4MOST sign at the VISTA telescope.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 31/10/2025

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

A group photo of the 4MOST Commissioning Team

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 24/10/2025

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

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Rubin LSST:UK @lsstuk.bsky.social · 23/10/2025

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

tinyurl.com

Portsmouth and Southampton scientists help secure the first capture of light in all its colours from cosmic objects

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 23/10/2025

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

A spectrum of an active galactic nucleus showing peaks for Mg, O, and H emission lines. The x-axis is wavelength, and the y-axis is intensity.

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University of Southampton @unisouthampton.bsky.social · 22/10/2025

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

The VISTA 4MOST, a large, intricate astronomical device, housed inside an industrial facility. The structure features a prominent circular component with visible wiring and metal framework, supported by a sturdy blue frame with stairs and a raised platform for access.

The VISTA mountain top observatory stands on rocky terrain under a clear night sky, with the Milky Way stretching across and a bright planet shining above.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 22/10/2025

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

A picture of the 4MOST PI, Roelof de Jong.

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ESO @eso.org · 21/10/2025

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

A view of the VISTA telescope and its 4MOST instrument. The structure is grey, with several cables visible around it. The telescope is viewed from above and is located inside a building with metallic walls.

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Durham University @durham.ac.uk · 21/10/2025

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

durham.ac.uk

New Telescope Captures First Light in Chile - Durham University

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Leibniz-Institut für Astrophysik Potsdam (AIP) @aippotsdam.bsky.social · 21/10/2025

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

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Max Planck Institute for Extraterrestrial Physics @mpe-garching.bsky.social · 21/10/2025

🤩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...

mpe.mpg.de

4MOST Begins its Journey of Cosmic Discovery

4MOST embarks on a cosmic journey, capturing spectra of thousands of celestial objects simultaneously, unlocking secrets of the universe.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 21/10/2025

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

youtu.be

First Light for 4MOST!

YouTube video by 4-meter Multi-Object Spectroscopic Telescope

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 18/10/2025

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

A hexagonal map showing the focal plane of the 4MOST instrument, with many coloured dots showing fibre positions for first light, each marking where light from a star or galaxy will be collected.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 16/10/2025

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

Bottles of sparkling wine placed in front of the 4MOST instrument, symbolising celebration as the team prepares for first light.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 14/10/2025

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

A yellow road sign showing a winding arrow standing on a desert mountain road leaning towards the 4MOST site, symbolising the twists and turns of the journey to first light.

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 10/10/2025

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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 10/10/2025

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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 10/10/2025

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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 10/10/2025

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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 10/10/2025

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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 09/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 09/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 08/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 08/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 07/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 07/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 06/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 06/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 05/10/2025

✨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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 05/10/2025

✨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

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Rubin LSST:UK @lsstuk.bsky.social · 03/10/2025

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...

A graphic featuring a headhsot and a quote from Dr Christopher Frohmaier

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 24/09/2025

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

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4-meter Multi-Object Spectroscopic Telescope (4MOST) @4most-eu.bsky.social · 17/09/2025

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

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ESO @eso.org · 22/07/2025

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

This is a top-down image of the front of a new instrument for ESO’s telescopes. At its outer edges is a ring of metal, within which sits a hexagonal structure made of thousands of fibres that are standing upright. From this angle, each one looks like a single point, and some of the fibres have been moved closer together so that they form a pattern within the hexagon. For this image, the pattern is the shape of a large number four.

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