| 单词 | asteroids |
| 释义 | asteroids(minor planets; planetoids) A number of small bodies that revolve around the sun between the orbits of Mars and Jupiter in a zone between 1.7 and 4.0 astronomical units from the sun (the asteroid belt ). The size of the bodies varies from the largest, Ceres (with a diameter of 933km), to objects less than 1km in diameter. It is estimated that there are about 10 bodies with diameters in excess of 250 km and some 120 bodies with diameters over 130 km |
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