An Asteroid Is Swinging By Earth Today For Its Closest Visit In 400 Years

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This composite of 30 images of asteroid 2014 JO25 was generated with radar data collected using NASA

Don’t worry: Astronomers say asteroid 2014 JO25, which is more than a third of a mile wide, will fly harmlessly past our planet. Still, it should come close enough to be visible with small telescopes.

(Image credit: NASA/JPL-Caltech/GSSR)