asteroid (planetoid)

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.)

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同义词： atmosphere_₁₀
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行业/领域：天文学
类别普通天文学
Company: Caltech
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