What do all the planet have in common?

When compared to the gases around them, sunspots are

Ancient astronomers thought the _____was the center of the universe (geocentric)

A system forms when

All of the following are examples of systems EXCEPT

The outer planets

6 out of 15 moons have craters. This is ___%

Watching the movement of stars across the sky would be an example of what kind of experiment?

We have many, many stars in our Solar System.

When a meteor lands on Earth, it is called a

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