Update 28 July 2016: COSI flight success! The COSI superpressure flight terminated on July 2nd after 46 days at float. The instrument was recovered from the desert in Peru and is being shipped back home. Stay tuned for updates on our science analysis and results!

COSI is a balloon-borne soft gamma-ray (0.2-10 MeV) telescope designed to study astrophysical sources of nuclear line emission and gamma-ray polarization. Learn more by reading about the Science behind COSI, its Design and related Publications.

The COSI Team launched the instrument from Wanaka, New Zealand, in May aboard a Super Pressure Balloon.  Learn about the work in their Blog PostsTwitter FeedFacebook Wall, or in the News.