Astronomy Terms

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Shadow

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A dark area or shape made by an object or organism blocking a source of light.

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Constellation

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A group of stars that appear to form a shape or picture in the sky.

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Star

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An object in space that produces its own energy, including heat and light.

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Light year

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The distance light travels in a year.

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Nebula

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A huge cloud of gas and dust in space that is the first stage of star formation.

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Planet

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Any large heavenly body that orbits a star (as the Sun).

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Astronomy

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The scientific study of stars, planets, and other objects in outer space.

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Sun

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The star at the center of our solar system that provides heat and light for the Earth.

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System

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A group of interacting or interdependent parts forming a complex whole, such as planetary bodies revolving around a star.

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Moon

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A natural satellite that orbits a planet.