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

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)