unique, one of a kind, matter, anything that takes up space and has weight, distance, the amount of space between two places, diameter, a line across a circle through the middle, core, the center part inside something, gravity, a force that pulls things down, surface, the outside part or a top layer of something, astronomer, a scientist who studies outer space, orbit, the path one object takes around another, space probe, a robot sent to explore space, craters, large bowl-shaped holes on a surface of a planet or moon

Space

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