Our sun will not become a black hole because it is

Our Sun will end as a

Which factor does not affect a stars luminosity?

Which object forms by the contraction of a large sphere of gases causing the nuclear fusion of lighter elements into heavier elements

By using a spectroscope as astronomer can

a light year measures

The first step in the life cycle of a star is

Andromeda serves as a model for our galaxy because

The Sun and Siruis have the same absolute magnitude, but the Sun appears much brighter because it is

In the center of every Galaxy, there is theoritcally a/an

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