
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.