| 单词 | near-earth asteroid |
| 释义 | near-Earth asteroidnear-Earth asteroidN5046070 (nîr′ûrth′)near-Earth asteroidnear-Earth asteroid(NEA) Any asteroid that has a chance of hitting our planet, specifically any member of the Apollo, Amor, and Aten groups. Although the annual probability of the Earth being struck by a large asteroid or comet is extremely small, the consequences of such a collision are so catastrophic that it was thought prudent in the USA to assess the nature of the threat and to be prepared to deal with it.See NEA |
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