3rd Grade Astronomy Terms

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Meteor

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A rock from space that burns up and looks like a shooting star when it falls through Earth's sky.

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Comet

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A ball of ice and dust that moves through space and has a bright tail when it gets close to the Sun.

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Asteroid

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A big rock that orbits the Sun, mostly found in a belt between Mars and Jupiter.

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Solar

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Related to the Sun, like solar energy, which comes from sunlight.

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Lunar

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Related to the Moon, like a lunar eclipse when the Moon moves into Earth's shadow.

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Eclipse

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When the Sun or Moon is covered up for a little while, like during a solar or lunar eclipse.

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Hypothesis

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A smart guess that scientists make before they do an experiment.

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Theory

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An idea that explains something in science, based on a lot of tests and facts.

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Constellation

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A group of stars that make a picture in the sky, like the Big Dipper.

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Galaxy

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A huge group of stars, planets, and space dust, like the Milky Way where we live.