Summary
Terrestrial planets are rocky planets with hard surfaces and include Mercury, Venus, Earth, and Mars.
Gas giants are much larger planets made mostly of gases like hydrogen and helium; these include Jupiter, Saturn, Uranus, and Neptune.
Mercury, the smallest planet and the closest to the Sun, which orbits the Sun faster than any other planet. Venus is the second planet from the Sun and is the brightest planet in the sky.
Finally, an atmosphere is defined as the layers of gases that surround Earth or other planets.
Space Vocabulary Free Worksheet
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