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4D Ch 3

TermDefinition
axis an imaginary line which runs through both poles of a planet
planet a large object that moves around a star
solar system a group of objects in space that move around a central star
comet a small mass of dust and ice that orbits the sun in a long, oval-shaped path
star a huge, burning sphere of gases; for example, the sun
asteroid a small rocky object that moves around the sun
inner planets the planets closest to the sun; Mercury, Venus, Earth, and Mars
outer planets the planets farthest from the sun; Jupiter, Saturn, Uranus, and Neptune
gas giants the planets Jupiter, Saturn, Uranus, and Neptune, which are large spheres made up mostly of gases
space probe a space vehicle that carries cameras, instruments, and other research tools
telescope a device people use to observe distant objects with their eyes
constellation the pattern formed by a group of stars in the sky
orbit the path that an object such as a planet makes as it revolves around a second object
Created by: mbeisert
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