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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
日期
来源 https://www.jpl.nasa.gov/images/asteroid/20180723/main-animation-16.gif
作者 NASA/JPL-Caltech

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© 本文件的著作权人，NASA/JPL-Caltech，允许任何人在适当地表明著作权人的姓名的前提下，以任何目的使用本文件。传播，演绎作品，商业用途及所有其他用途被允许。
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Courtesy NASA/JPL-Caltech

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