#4MOST
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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
pomarede.bsky.social
Thousands of eyes on the sky: 4MOST sees first light

www.eso.org/public/annou...

@eso.org @4most-eu.bsky.social 🧪🔭
Thousands of eyes on the sky: 4MOST sees first light
Thousands of eyes on the sky: 4MOST sees first light
www.eso.org
October 21, 2025 at 1:17 PM
mercoglianos.bsky.social
Escape From the Strait of Hormuz...Sort of!

1⃣Is the Strait Open or Closed
2⃣IRGC attack on Three Ships
3⃣Dark Fleet Ships Escape
4⃣Most Ships Turn Around
5⃣Cruise Ships Escape

Video: youtu.be/G8eP2Oqps24
April 18, 2026 at 5:47 PM
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
pomarede.bsky.social
The 4MOST fibre positioner

Each optical fibre is mounted on a spine that can be tilted to point at a specific astronomical object. Thanks to this design, 4MOST can take spectra of 2400 objects simultaneously.

Credit: Roelof de Jong 🧪🔭 @4most-eu.bsky.social @eso.org

www.eso.org/public/image...
The 4-metre Multi-Object Spectroscopic Telescope (4MOST) fibre positioner. Each optical fibre is mounted on a spine that can be tilted to point at a specific astronomical object. The light collected by each fibre is then directed to spectrographs that split it into its constituent colours. Thanks to this design, 4MOST can take spectra of 2400 objects simultaneously.
October 21, 2025 at 5:41 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
eso.org
2/ If you want to learn more about 4MOST, head over to the ESO Blog to learn about:

👉 the technical challenges of observing thousands of objects simultaneously
👉 the scientific questions @4most-eu.bsky.social will address

www.eso.org/public/blog/...

🔭 🧪
#instrumentation
ESOblog: The magic behind 4MOST Thousands of eyes to chart the sky
The magic behind 4MOST
www.eso.org
October 21, 2025 at 1:28 PM
galacticrave.bsky.social
First Light for 4MOST - what an experience! Paranal Observatory is already a magic place on its own right - but getting a new facility on sky ... that's hard to top! www.aip.de/en/news/4mos...
4MOST Captures First Light
On October 18, 2025, the 4-metre Multi-Object Spectroscopic Telescope (4MOST) facility, installed on the VISTA telescope at the European Southern Observatory’s (ESO) Paranal Observatory in Chile, obta
www.aip.de
October 21, 2025 at 12:24 PM
pomarede.bsky.social
Première lumière de 4MOST, le cosmographe nouvelle génération

Grâce à sa technologie de pointe, 4MOST peut étudier la lumière de 2400 objets célestes simultanément; et cela tous les quarts d’heure. 🧪🔭 @4most-eu.bsky.social

www.cnrs.fr/fr/presse/pr... @cnrs.fr
Première lumière de 4MOST, le cosmographe nouvelle génération
Le spectrographe 4MOST a commencé à cartographier le ciel à une vitesse record, en analysant simultanément les lumières émises par 2400 objets célestes.Comptant une importante contribution française p...
www.cnrs.fr
October 21, 2025 at 1:13 PM
mercoglianos.bsky.social
Escape From the Strait of Hormuz...Sort of!

1⃣Is the Strait Open or Closed
2⃣IRGC attack on Three Ships
3⃣Dark Fleet Ships Escape
4⃣Most Ships Turn Around
5⃣Cruise Ships Escape

Video: youtu.be/G8eP2Oqps24
April 19, 2026 at 2:16 PM
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
sciencenewsroom-ug.bsky.social
✨ Searching for the first generation of stars

Else Starkenburg, astronomer @rug.nl @kapteynastro.bsky.social is searching for early-generation stars in nearby galaxies with the international programmes WEAVE and 4MOST to see what they are made of

Read more 👇
🔗 www.rug.nl/fse/news/mat...
🧪 #SciComm
Else Starkenburg
September 24, 2026 at 1:05 PM
eso.org
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.
July 22, 2025 at 7:45 AM
inzawoods.bsky.social
4st and 4most
February 2, 2026 at 3:56 PM
rbb24.de
Es ist ein Riesenprojekt. 30 Forschungseinrichtungen und 1.000 Menschen weltweit haben daran mitgearbeitet: am Spektrograf 4MOST. Das Herz dieses Projekts schlägt in Potsdam am Leibniz-Institut für Astrophysik.
October 22, 2025 at 7:06 PM
galacticrave.bsky.social
HiRes spectrograph of 4MOST being lifted into the VISTA telescope, the two LoRes are already in the basement. (photos by Andreas Kelz @aippotsdam.bsky.social )
September 11, 2025 at 4:11 PM
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
4most-eu.bsky.social
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
September 17, 2025 at 12:16 PM
alfreds-mad-world.bsky.social
First & Foremost • Tom Koch

Hey Gang, Tom Koch Began His MADness In MAD Magazine Issue No. 34 From 1957. Being Able To Recognize A Writers Work & His Growth Only Comes From Familiarization With Their Work (which is the point of 1st&4most & all the subsequent posts).

#writerwednesday #madmagazine
September 17, 2025 at 6:47 PM
4most-eu.bsky.social
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.
November 19, 2025 at 7:40 AM
natastron.nature.com
Great to see 4MOST obtaining first light. We featured 4MOST in our Mission Control column back in 2019: www.nature.com/articles/s41...
October 21, 2025 at 12:25 PM
4most-eu.bsky.social
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
January 30, 2026 at 11:22 AM
drsupermario2.bsky.social
DiFuture- "BLESSED" (Production by DiFuture & 4MOST) difuture.bandcamp.com/album/blesse...
BLESSED, by DiFuture
10 track album
difuture.bandcamp.com
December 22, 2025 at 4:57 PM
sugarzulu79.homepc.ca
Just this week Loblaws announced that they are removing the shelf labeling for Made in Canada products!The government must make it mandatory for big corporations (especially US owned) to keep the labeling in place!Fine Loblaws until they understand that Canadians want to buy Canadian first and 4most
August 22, 2026 at 11:41 PM
raumfahrer.bsky.social
AIP: 4MOST-Meilenstein: 1. große Lieferung nach Chile
Bedeutender Meilenstein für 4MOST-Projekt: Leibniz-Institut für Astrophysik Potsdam beginnt mit 1. großer Lieferung Versand des 4MOST-Instruments nach Chile.Pressemitteilung #AIP Bild:AIP/A.Saviauk #VISTA #4most
www.raumfahrer.net/aip-4most-me...
Das 4MOST-Cable-Wrap-System, eingepackt fürs Verschiffen. (Bild: AIP/A. Saviauk)
March 24, 2024 at 12:04 PM