MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Artwork of a subgiant star seen from the surface of a barren planet. A subgiant is a star that has exhausted the hydrogen in its core and which as a result has left the main sequence and began to swell. A subgiant star typically has about three times the diameter of the star it was on the main sequence.
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