[NormsRevenge]

A NASA image of the debris of an exploded star, known as supernova taken from
NASA's Chandra X-Ray Observatory. Astronomers who have long used supernovas as cosmic mile markers
to help measure the expansion of the universe now have an answer to the nagging question
of what sparks the massive stellar explosions. (AFP/NASA/File)

[NormsRevenge]

Chandra X-ray Center, Operated for NASA by
the Smithsonian Astrophysical Observatory
This site was developed with funding from NASA under contract NAS8-03060.
http://chandra.harvard.edu/

M31:
NASA’s Chandra Reveals Origin of Key Cosmic Explosions
http://chandra.harvard.edu/photo/2010/type1a/