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Across 3. Millions or billions of stars pulled together by their own gravity 5. A group of planets orbiting a star 7. A round pit left behind on the surface of a planet or other body in space after a smaller object strikes the surface 9. A path of an object in space that goes around another object because of gravity 10. Space and all the matter and energy in it

Down 1. A satellite in which people can live and work for long periods 2. A spacecraft that is sent into a planet's atmosphere or onto a solid surface 4. A device that gather visible light or anther form of electromagnetic radiation 5. A range of colors from light that goes through a prism 6. An object that orbits another object 8. A craft designed to land on a planet's surface