4-meter Multi-Object Spectroscopic Telescope (4MOST)
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4-meter Multi-Object Spectroscopic Telescope (4MOST)
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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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
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✨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
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✨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
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✨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
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✨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
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✨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
October 7, 2025 at 1:39 PM
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✨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
October 7, 2025 at 8:33 AM
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✨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
October 6, 2025 at 1:36 PM
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✨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
October 6, 2025 at 7:18 AM
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✨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
October 5, 2025 at 1:38 PM
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✨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
October 5, 2025 at 7:41 AM
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Join the 4MOST collaboration in celebrating World Space Week! 🔭

📷: A. Saviauk/AIP

#worldspaceweek #4most #telescope #astronomy #astrophysics #science #observatory
October 4, 2025 at 7:53 AM
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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
September 24, 2025 at 12:55 PM