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Which of the following stars is the coolest? Sirius, a type A star Arcturus, a type K star Spica, a type B star Antares, a type M star
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Which of the following stars is the coolest? Sirius, a type A star Arcturus, a type K star Spica, a type B star Antares, a type M star

User Greg Howell
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Antares, a type M star.

User PeterMmm
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The start type that is considered to be the coolest among the choices provided would be the type K star, which is Spica. In addition, the classification of different star types is in accordance with the Morgan-Keenan spectral classification system wherein they are group according to their luminosity types.
User Rickson
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