The above graph is a light curve of M31, as observed with a ground
telescope at the local university, from October 10, 1999 until November 24,
1999 (observations were not at regular intervals).
Imagine the Universe is a service of the High Energy Astrophysics Science Archive Research Center (HEASARC), Dr. Alan Smale (Director), within the Astrophysics Science Division (ASD) at NASA's Goddard Space Flight Center.
The Imagine Team
Acting Project Leader: Dr. Barbara Mattson
All material on this site has been created and updated between 1997-2012.