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(g) How does the colour of a star help to find its age?
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(g) How does the colour of a star help to find its age?

User Kanwaljeet Singh
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they run out of hydrogen to burn, decreasing the amount of energy they emit. Thus, younger stars can appear bluer while older ones appear more red, and in this way, a star's color can tell us something about that star's age.
User Neil Smithline
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