OBSS in Space
Welcome to the web pages of the Origins Billion Star Survey (OBSS). OBSS is an astrometric satellite designed to determine with unprecedented accuracy the positions, distances, and motions of a billion stars within our galaxy. It is a collaborative effort between the U.S. Naval Observatory (USNO) and several other institutions. OBSS will measure stellar positions to less than 10 microarcseconds. (To put this angle in perspective, the width of a typical strand of human hair would subtend 10 microarcseconds if you were viewing it from a distance of 650-900 miles.)

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News
News, announcements, press releases, and recent changes to this web site.
Science
An introduction to the wealth of fundamental astronomy that OBSS will impact.
Frequently Asked Questions
Background information and questions that often come up.
Presentations and Publications
Presentations or talks given about OBSS, and the Concept Study Report.
Contact Information
Press contact information.

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