Astronomy Flashcards

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Flashcards about the Universe, Solar System, Planets, and Stars

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7 Terms

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Universe

Space and all the matter and energy in it.

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Solar System

The collection of large and small bodies that orbit our central star, the sun.

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Planet

A spherical body that orbits the sun.

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Terrestrial Planets

Mercury, Venus, Earth, and Mars; rocky, dense, and relatively small.

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Gas Giant Planets

Jupiter, Saturn, Uranus, and Neptune; have thick, gaseous atmospheres; small, rocky cores; and ring systems of ice, rock, and dust.

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Star

A large celestial body that is composed of gas and emits light.

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Star Composition

Mostly hydrogen and helium.