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Astronomy with an online telescope

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Described image
Figure 7 The Hertzsprung-Russell diagram showing the evolutionary path of a star such as our Sun after it leaves the main sequence. First the star will expand to form a red giant before collapsing eventually to form a white dwarf. On their way to becoming red giants, some stars will pass through the instability strip, becoming variable stars. Heavier stars, further up the main sequence, may pass through this region more than once.

 4.3 After the main sequence