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this is a Hubble Space Telescope image

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of the crowded core of the globular

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cluster Omega Centauri the brilliant

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colors of the stars are real they

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correspond to stellar temperatures they

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can also be used to trace stellar

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evolution astronomers like to know how

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blue the blue stars are and how red the

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red stars are so we'll first sort these

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stars out by color blue on the left and

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red on the right next we'll sort the

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stars according to brightness the

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brightest stars at the top and the faint

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stars at the bottom the final plot you

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see represents different stages of

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evolution of stars stars spend most of

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their lifetime burning on the main

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sequence when their fuel starts to run

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out they expand to become red giants

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they find a new source of fuel helium

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and burn blue hot but even that runs out

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they end up burning out as white dwarfs

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based on images for the hubble space

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telescope we've assembled a true plot