File:Asteroids-KnownNearEarthObjects-Animation-UpTo20180101.gif
摘要
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English: Twenty Years of Planetary Defense - July 23, 2018
https://www.jpl.nasa.gov/news/news.php?feature=7194 Animation depicts a mapping of the positions of known near-Earth objects The animation depicts a mapping of the positions of known near-Earth objects (NEOs) at points in time over the past 20 years, and finishes with a map of all known asteroids as of January 2018. Asteroid search teams supported by NASA's NEO Observations Program have found over 95 percent of near-Earth asteroids currently known. There are now over 18,000 known NEOs and the discovery rate averages about 40 per week. Image credit: NASA/JPL-Caltech |
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| 来源 | https://www.jpl.nasa.gov/images/asteroid/20180723/main-animation-16.gif |
| 作者 | NASA/JPL-Caltech |
许可协议
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