Astronomy Picture of the Day
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December 3, 1995
An X-ray Hot Supernova in M81
NASA, Y. Kohmura
In 1993, a star in the galaxy
Above is a picture of the hot material ejected by this
The picture was taken in
X-rays with the
Satellite for Cosmology and Astrophysics
Since M81 is a relatively nearby galaxy, it can be
examined in close detail by observatories on or near the
Earth. Since the
Earth's atmosphere protects the surface from
interstellar X-radiation, the
photo was taken from space. Studying
the nature and distribution of the X-rays has allowed astronomers to
determine the composition and temperature of the expanding supernova gas.
Tomorrow's picture: GL 229B: An Elusive Brown Dwarf?
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