planet - A large object from space that revolves around a star and often has one or more satellites.
moon - A planet's natural satellite.
star - A ball of gas that gives out heat and light.
universe - All of space. Everything.
galaxy - A system of billions of stars and other things.
solar system - A sun that has planets and other things orbiting it.
asteroid - Space objects that are between 1 and 500 kilometres across and that orbit around the sun.
astronaut - A person who goes into space and explores it.
gravity - A force that draws planets and other objects near it.
space shuttle - The rocket that is used to go into space.
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