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

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