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What are G- type and M- type in astronomy?

Updated: 8/20/2019
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11y ago

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They are yellow and red stars. When the light from stars started to be analysed with spectroscopes, all the stars were classified into different types of spectrum. The main spectral types are A, F, G, K and M, with A the hottest and M the least hot. A-type stars are white (Rigel), while M types are red (Betelgeuse). The Sun is a G type of very average temperature.

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Q: What are G- type and M- type in astronomy?
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