The theory that states that the universe is constantly expanding is called...

Astronomy is the study of...

A light year measures...

A large group of stars is called..

Which of the following terms best describes Pluto\'s status as a celestial body?

What type of reaction occurs inside the sun?

Which planet is closest to the sun?

What causes seasons on Earth?

During which phase of the moon does a lunar eclipse occur?

What causes the tides?

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