The Hertzsprung-Russell diagram plots stars according to:

Which type of galaxy is the Milky Way?

The Milky Way is about _____________ years across.

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Which of the following best describes a nebula?

Precession of Earth’s axis has a cycle of about:

The expansion of the universe was discovered by 

The Sun is currently in which stage of its life cycle?

Retrograde motion refers to:

The force that keeps planets in orbit around the Sun is