Definition: Chandra X-ray Observatory (CXO): One of NASA's Great Observatories in Earth orbit, launched in July 1999, and named after S. Chandrasekhar. It was previously named the Advanced X-ray Astrophysics Facility (AXAF).
From Nick Greene, former About.com Guide
©2012 About.com. All rights reserved.
A part of The New York Times Company.