Basic Astronomy Terms

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Gas Giant

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A very big planet made mostly of gas, like Jupiter or Saturn.

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Planetesimals

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Small space rocks that stick together to make planets.

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Kuiper Belt

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A group of icy objects far past Neptune in our solar system.

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Terrestrial Planet

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A rocky planet like Earth or Mars.

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Inertia

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The way things keep moving or stay still unless something stops or moves them.

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Galaxy

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A huge group of stars, planets, and dust all held together in space.

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Solar Nebula

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A big cloud of gas and dust that made our solar system.

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Astronomy

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The study of stars, planets, and space.

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Planet

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A big round object that moves around a star, like Earth around the Sun.

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Exoplanets

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Planets that orbit stars outside our solar system.