File:Asteroids-KnownNearEarthObjects-Animation-UpTo20180101.gif

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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

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Public domain 本文件完全由NASA创作,在美国属于公有领域。根据NASA的版权方针,NASA的材料除非另有声明否则不受版权保护。(参见Template:PD-USGov/zhNASA版权方针页面JPL图片使用方针。)
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