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Recent News: COSI 2020 is underway! We’re currently working at the Columbia Scientific Balloon Facility in Palestine, Texas. This work is in preparation for our upcoming spring Wanaka, NZ balloon launch.


COSI is a balloon-borne soft gamma-ray (0.2-5 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 2016 aboard a Super Pressure Balloon.  Learn about the work in their Blog PostsTwitter FeedFacebook Wall, or in the News.