red supergiant

Science Dictionary
red supergiant  
An extremely large red giant star with a minimum of 15 solar masses. The best known red supergiant is Betelgeuse, with a luminosity about 10,000 times that of the Sun. When a supergiant collapses into a supernova, it may result in either a neutron star or a black hole.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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