Check out these photos of @ucbssl.bsky.social engineers assembling COSI flight instrumentation in July 2026.

COSI's detector assembly is featured in NASA's image of the day 🎉 www.nasa.gov/image-articl...

COSI Telescope Comes Together - NASA

UC Berkeley engineers and managers watch as the COSI (Compton Spectrometer and Imager) detector assembly is slowly raised from a table in this July 8, 2026,

nasa.gov

New photos and video documenting the COSI payload assembly at @ucbssl.bsky.social have posted on NASA's Scientific Visualization Studio. 🔭🧪🛰️👇 svs.gsfc.nasa.gov/15088

NASA Scientific Visualization Studio | UC Berkeley Assembles Upcoming COSI Mission

Engineers Bradley Pafchek and Matt Rubly examine the COSI (Compton Spectrometer and Imager) detector assembly at Space Sciences Laboratory on July 15, 2026. COSI is an upcoming spacecraft that will measure gamma rays, the highest-energy form of light, to help scientists study energetic phenomena in the Milky Way and beyond. Credit: UC Berkeley/Alan Toth Alt text: Two people examine the COSI detector assembly.Image description: Two people stand on yellow step ladders and lean over to examine a small gold box. The box is centered inside the top of a hexagonal white frame. A larger hexagonal silver and black box extends from the bottom of the frame. The person on the left wears a blue cleanroom suit, and the one on the left wears a white one. They both wear hairnets, masks, gloves, and shoe covers. A floor-to-ceiling plastic sheet separates the back of the room, which is full of metal shelving and boxes. || COSI_2026July_19_half_print.jpg (1024x682) [223.9 KB] || COSI_2026July_19.jpg (5000x3333) [4.6 MB] || COSI_2026July_19_half.jpg (2500x1667) [576.0 KB] ||

svs.gsfc.nasa.gov

Aerospace engineers with @ucbssl.bsky.social have just assembled the detector array for the COSI mission.

COSI detector array assembly

YouTube video by UC Berkeley Space Sciences Laboratory

youtu.be

Thanks to Dr. Nicky Fox, Associate Administrator for NASA's Science Mission Directorate, for stopping by @ucbssl.bsky.social to see COSI being assembled at the lab. Hopefully you’ll enjoy building the LEGO COSI at home!

COSI is coming together! @ucbssl.bsky.social’s senior aerospace engineer Christopher Smith and aerospace instrumentation mechanical engineer Matt Rubly recently assembled the mission’s 16 germanium detectors.

Congrats to Isidro Pena, an undergraduate research assistant at SSL who works on the @cosi-explorer.bsky.social! Pena was one of the undergraduate winners of the Chambliss Astronomy Achievement Student Award poster competition at the 248th meeting of the @aas.org! 🙌🎉🧪🔭 aas.org/posts/news/2...

Congrats to Nicolas Lopez, graduate student at George Washington University and research assistant on the COSI mission! Lopez was one of the graduate winners of the Chambliss Astronomy Achievement Student Award poster competition at the 248th meeting of the @aas.org. Way to represent the mission🙌🎉!

COSI was covered in this article published by @us.theconversation.com. One of COSI’s science objectives—to seek out the source of the gamma ray signature of matter/antimatter annihilation—may help reveal whether the center of our galaxy is rich in dark matter. theconversation.com/upcoming-tel...

Upcoming telescopes could shed light on dark matter – astronomers are looking for these ‘fingerprints’ of the elusive substance

Scientists study small galaxies to look for hints of dark matter in the universe.

theconversation.com

3D printed COSI model assembly.

Meet NASA’s COmpton Spectrometer and Imager (COSI). Launching in 2027, COSI is a wide-field gamma-ray telescope that will study extreme objects, environments, and events in the Milky Way and beyond. science.nasa.gov/mission/cosi/

COSI - NASA Science

COSI is an Astrophysics Small Explorer satellite mission that will probe the origins of our galaxy’s antimatter, uncover sites in our galaxy where complex

science.nasa.gov

Big Give is TODAY! 🎉Learn more about SSL's history below, and please consider donating to support our mission in education, innovation and discovery.👇 #CalBigGive givingday.berkeley.edu/giving-day/1...

John Tomsick explains how COSI will search the skies for gamma rays in hopes of learning more about black holes and neutron stars.

There's a lot of antimatter at the center of our galaxy. Where's it coming from? John Tomsick, PI of COSI, aims to find out.

What's a Compton telescope? John Tomsick, PI of COSI, explains.