Earth Has Just One Moon, Right? Think Again

The squiggly lines on this image show the path of a simulated minimoon that is temporarily captured by Earth. The asteroid in the corner of the image, 1999 JM8, is nearly 2 miles across and more than 1,000 times larger than the minimoons.
The squiggly lines on this image show the path of a simulated minimoon that is temporarily captured by Earth. The asteroid in the corner of the image, 1999 JM8, is nearly 2 miles across and more than 1,000 times larger than the minimoons.