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Mrs. Gaines Vocab

Astronomy Vocabulary

TermDefinition
Terrestrial planet One of the highly dense planets nearest to the sun; Mercury, Venus, Mars, and Earth
Prograde rotation The counterclockwise spin of a planet or moon as seen from above the planet's North pole
Retrograde rotation The clockwise spin of a planet or moon as seen from above the planet's North Pole
Gas giant A planet that has a deep, massive atmosphere, such as Jupiter, Saturn, Uranus, or Neptune
nebula A region in space where stars are born or where stars explode
Globular cluster A tight group of stars that looks like a ball and contains up to 1 million stars
Open cluster A group of stars that are close together to surrounding stars
Quasar A very luminous, starlike object that generates energy at a high rate
Created by: againes1
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