4-meter Multi-Object Spectroscopic Telescope (4MOST)
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4-meter Multi-Object Spectroscopic Telescope (4MOST)
@4most-eu.bsky.social
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Check out this amazing video from Chris Pattison (@cosmochris.bsky.social) describing 4MOST and our First Light observations!

#4MOST #astronomy #astrophysics #telescope #observatory
The Telescope That Sees 18,000 Colours
YouTube video by Chris Pattison
youtu.be
November 3, 2025 at 5:54 AM
4most-eu.bsky.social
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
October 31, 2025 at 8:01 AM
4most-eu.bsky.social
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
October 24, 2025 at 12:40 PM
Reposted by 4-meter Multi-Object Spectroscopic Telescope (4MOST)
lsstuk.bsky.social
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
Portsmouth and Southampton scientists help secure the first capture of light in all its colours from cosmic objects
tinyurl.com
October 23, 2025 at 1:13 PM
4most-eu.bsky.social
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.
October 23, 2025 at 11:22 AM
4most-eu.bsky.social
Meet the team!

Image Credit: M. Gammel

#4MOST #astronomy #astrophysics
A mosaic of hexagonal pictures of 4MOST team members, laid over an image of the 4MOST focal plane.
October 22, 2025 at 12:55 PM
Reposted by 4-meter Multi-Object Spectroscopic Telescope (4MOST)
unisouthampton.bsky.social
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.
October 22, 2025 at 8:46 AM
4most-eu.bsky.social
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.
October 22, 2025 at 6:20 AM
Reposted by 4-meter Multi-Object Spectroscopic Telescope (4MOST)
eso.org
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.
October 21, 2025 at 1:28 PM
Reposted by 4-meter Multi-Object Spectroscopic Telescope (4MOST)
durham.ac.uk
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
New Telescope Captures First Light in Chile - Durham University
www.durham.ac.uk
October 21, 2025 at 12:32 PM
Reposted by 4-meter Multi-Object Spectroscopic Telescope (4MOST)
aippotsdam.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
October 21, 2025 at 12:20 PM
Reposted by 4-meter Multi-Object Spectroscopic Telescope (4MOST)
mpe-garching.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...
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.
www.mpe.mpg.de
October 21, 2025 at 12:01 PM
4most-eu.bsky.social
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
First Light for 4MOST!
YouTube video by 4-meter Multi-Object Spectroscopic Telescope
youtu.be
October 21, 2025 at 12:00 PM
4most-eu.bsky.social
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.
October 18, 2025 at 10:15 AM
4most-eu.bsky.social
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.
October 16, 2025 at 11:06 AM
4most-eu.bsky.social
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.
October 14, 2025 at 11:48 AM
4most-eu.bsky.social
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
October 10, 2025 at 1:09 PM
4most-eu.bsky.social
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
October 10, 2025 at 1:09 PM
4most-eu.bsky.social
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
October 10, 2025 at 1:09 PM
4most-eu.bsky.social
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
October 10, 2025 at 8:17 AM
4most-eu.bsky.social
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
October 10, 2025 at 8:16 AM
4most-eu.bsky.social
✨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
October 9, 2025 at 12:52 PM
4most-eu.bsky.social
✨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
October 9, 2025 at 7:08 AM
4most-eu.bsky.social
✨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
October 8, 2025 at 1:22 PM
4most-eu.bsky.social
✨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
October 8, 2025 at 6:56 AM