1) All of space, and all the matter and energy that space contains 2) A collection of gas, dust, and billions of stars and their solar systems, held together by gravity 3) A star and everything that orbits, or travels around it 4) How many planets in our solar system? 5) To move in a regular path around another object in space 6) A very large ball of bright, glowing matter in space that is very hot, like the Sun 7) A large, round object that orbits a star 8) What is the sun made of? 9) To move around a central point 10) The force by which a star or planet draws objects toward its center

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