a person who studies space, stars, and planets., Astronomer, a machine sent into space to collect information., Space probe, the center part of something., Core, the force that pulls things down., Gravity, the path a planet or moon follows around another object., Orbit, everything that has weight and takes up space., Matter, how far one thing is from another., Distance, the distance across a circle through the center., Diameter, the outside or top part of something., Surface, large round holes on the surface of a planet or moon., Craters, special and different from everything else., Unique

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