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| as·ter·oid belt (plural as·ter·oid belts) |
noun |
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1. asteroid region of solar system: the region in the solar system between the orbits of Mars and Jupiter, approximately 2.0 and 3.5 astronomical units from the Sun, in which most of the asteroids orbit
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2. region of numerous asteroids: a region of space where the density of asteroids is high, located between the orbits of Mars and Jupiter
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