Old Stars

David A. Aguilar, Harvard-Smithsonian Center for Astrophysics
January 5, 2015
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David A. Aguilar, Harvard-Smithsonian Center for Astrophysics
It's harder to tell the age of an older star because they rotate more slowly and have smaller starspots. (Image credit: David A. Aguilar, Harvard-Smithsonian Center for Astrophysics)