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asteroid (planetoid)
Also called planetoids or minor planets, the asteroids are tiny planets most of which orbit the Sun between Mars and Jupiter. The largest - and the first discovered - is Ceres, with a diameter of 1,003 km. It is estimated that there may altogether be no fewer than 40000. A few have very elliptical orbits and cross the orbits of several other (major) planets. One or two even have their own satellites (moons.)
- Part of Speech: noun
- Industry/Domain: Astronomy
- Category: General astronomy
- Company: Caltech
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Creator
- svetiana
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