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A '''red giant''' is a large star of type K or M which is off the main sequence. They are believed to be stars of solar mass or higher which have started ] which causes the outer layers of the star to massively expand. This expansion is consistently predicted by numerical simulations of stellar evolution, yet astronomers find it difficult to state in words why it happens. A '''red giant''' is a large ] of ] K or M which is off the ]. They are believed to be stars of ] mass or higher which have started ] which causes the outer layers of the star to massively expand. This expansion is consistently predicted by numerical simulations of ], yet astronomers find it difficult to state in words why it happens.

Revision as of 14:52, 11 June 2002

A red giant is a large star of spectral class K or M which is off the main sequence. They are believed to be stars of solar mass or higher which have started helium fusion which causes the outer layers of the star to massively expand. This expansion is consistently predicted by numerical simulations of stellar evolution, yet astronomers find it difficult to state in words why it happens.