astronomer, a scientist who studies stars, planets, and space, space probe, a spacecraft sent into space to collect information without people on it, core, the center or innermost part of something, gravity, the force that pulls objects toward each other, like Earth pulling us down, orbit, the path an object follows as it moves around another object in space, matter, anything that has mass and takes up space, distance, the amount of space between two points or objects, diameter, the length of a straight line across a circle through its center, surface, the outer or top layer of something, craters, large round holes on a planet or moon made by impacts, unique, one of a kind; different from anything else.

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