The unit of measurement used by astronomers to express distance in space is called?
Galaxies are classified by their ....?
A galaxy that is moving away from the Earth will show what color shift?
By looking at the color of a star, astronomer can tell what about it?
What star is the closest to our Earth?
Which one is not a type of galaxy?
What is not a characteristic of our Sun?
What type of galaxy is the Milky Way?
Which is not a type of nebula?
What type of star is or Sun?
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