Gravity and orbits
Gravity pulls every object toward every other object, and the more mass something has, the stronger its pull. The sun's huge mass is what keeps all the planets orbiting around it instead of flying off into space, and in the same way, a planet's own gravity is what keeps its moons in orbit around it. The same force works at a much bigger scale too: the combined gravity of billions of stars, including our sun, is what holds an entire galaxy like the Milky Way together and keeps those stars orbiting around its center.
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This final covers a lot of topics, so it's split into 2 parts. Each part includes a question from every one of its topics.
Final, Part 1 of 2
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