ASCA (Advanced Satellite for Cosmology and Astrophysics) was an X-ray astronomy spacecraft that studied distant active galaxies, sources of the cosmic X-ray background, and other phenomena. The mission was developed by the Japanese Institute of Space and Astronautical Science with significant U.S. contributions, including NASA.
Feb. 20, 1993
July 15, 2000
This artist's conception shows the ASCA spacecraft.