What planets were called long ago - wanderers, At the center of the solar system - Sun, Stars that only seem to be grouped close together - constellations, Measurement of the distance light can travel in a year - light year, Hundreds of billions of stars clustered together - galaxy, A ball of ice, dust, and gases that revolves around the sun - comet, a rocky body that orbits the sun like a planet - asteroid, Kepler, Copernicus, and Ptolemy were all famous - astronomers, Shows how something looks or works - model, orbit shaped like a flattened oval - elliptical,

Astronomy

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