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SlideshowReport

An H-R Diagram of a Globular Cluster

Description
An H-R Diagram of a Globular Cluster
Each dot on this graph represents the absolute magnitude and surface
temperature of a star in the globular cluster M55. Note that the upper
half of the main sequence is missing. The horizontal-branch stars are
stars that recently experienced the helium flash in their cores and
now exhibit core helium fusion and hydrogen shell fusion.
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