Cassiopeia A, Supernova Remnant, X-ray
by Science Source
Title
Cassiopeia A, Supernova Remnant, X-ray
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Science Source
Medium
Photograph - Photograph
Description
Cas A is the remnant of a star that exploded about 300 years ago. The X-ray image shows an expanding shell of hot gas produced by the explosion. This gaseous shell is about 10 light years in diameter, and has a temperature of about 50 million degrees. Cassiopeia A (Cas A) is a supernova remnant (SNR) in the constellation Cassiopeia and the brightest extrasolar radio source in the sky at frequencies above 1 GHz. Release date August 26, 1999.
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December 2nd, 2015
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