Q:

Which color stars have the coolest surface temperature?

A:

Quick Answer

Star type M, the red stars, are the coolest stars with an average surface temperature of under 3,500 K. This type of star has a 0.3 solar mass (M☉) and an average radius of 0.4 solar radius (R☉). Examples of red stars are Betelgeuse and Antares.

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Full Answer

Stars are classified by the elements they absorb and their temperature. The seven main types of stars in decreasing temperature are O, B, A, F, G, K and M. O, B and A star types have approximate surface temperatures of 7,500 to over 25,000 K and are blue. F star types have an approximate surface temperature of 6,000 to 7,500 K and are blue to white.

G star types range in temperature from 5,000 to 6,000 K and are white to yellow. K star types range in temperature from 3,500 to 5,000 K and are orange to red. The last start type is M, and they have an approximate surface temperature of under 3,500 K and are red.

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