| 单词 | near-earth object |
| 释义 | near-earth object[ neer-urth ] / ˈnɪərˈɜrθ / noun Astronomy.a comet or asteroid pushed by the gravitational attraction of nearby planets into an orbit that allows it to enter the earth's orbit and thereby pose a danger of collision. Abbreviation: NEO Words nearby near-earth objectnear at hand, near beer, nearby, Nearctic, near-death experience, near-earth object, Near East, Nearer Tibet, nearest and dearest, Near Field Communication, near gale Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Scientific definitions for near-earth objectnear-Earth object [ nîr′ûrth′ ] A comet or asteroid with an orbit or trajectory that comes near Earth's orbit, often drawn into such a path by the gravitational effect of the Earth and other planets. While there is currently no known near-Earth object on a collision course with Earth, collisions with such objects have taken place in the past and may be associated with mass extinctions such as those that took place at the end of the Permian and Cretaceous Periods. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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