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What does the color of a star indicate?

Find out what the color of a star indicates.

The color of a star indicates its temperature and age. [©Jupiter Images, 2010]
©Jupiter Images, 2010
The color of a star indicates its temperature and age.

The color of a star indicates its temperature and age. Stars are classified by their spectral type. From oldest to youngest and hottest to coolest, the types of stars are listed below:

Type Color Temperature
    Fahrenheit Celsius
O Blue 45,000-75,000 25,000-40,000
B Blue 20,800-45,000 11,000-25,000
A Blue-white 13,500-20,000 7,500-11,000
F White 10,800-13,500 6,000-7,500
G Yellow 9,000-10,800 5,000-6,000
K Orange 6,300-9,000 3,500-5,000
M Red 5,400-6,300 3,000-3,500


Each type is further subdivided on a scale of 0-9. The sun is a type G2 star.

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