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-aster
aster
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asteroid belt
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asteroid belt

as·ter·oid belt (plural as·ter·oid belts)


noun 
Definition:
 
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

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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