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Children's Dictionary
atmosphere the gases surrounding the earth or other similar objects in outer space. [1/3 definitions]
celestial of or having to do with the sky or outer space. [1/2 definitions]
meteorite a piece of rock from outer space that has landed on Earth.
outside on, in, or to the outer space of. [1/6 definitions]
planet a large body in outer space that circles around the sun or another star. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto are all planets in our solar system.
science fiction a kind of fiction writing that is often about people living in the far future or about life on other planets or in other galaxies. Science fiction often tells of future scientific inventions or of strange beings or creatures from outer space.
shooting star a chunk of metal or rock from outer space that burns up as it enters the earth's atmosphere; meteor.
space the area that contains the entire universe beyond the earth; outer space. [1/7 definitions]
spacecraft a vehicle designed to travel in outer space.
spaceship a vehicle designed to carry people and cargo in outer space, as to the moon or the other planets.
spacesuit a suit worn by astronauts that lets them breathe in outer space.
spacewalk the action of an astronaut moving about outside a spacecraft in outer space.
vacuum a space or container from which most of the air has been removed. Outer space and the inside of a light bulb are examples of vacuums. [1/4 definitions]
voyage a long journey by air, land, sea, or outer space. [1/2 definitions]