Space tracking expert Bill Gray predicts an impact of 5,400 mph (8,700 kph) — seven times the speed of sound — near Einstein Crater on the moon’s sunlit western limb. With the action unfolding in the wee hours, the eastern portions of the U.S. and Canada, and much of South America should have the best views.

See our favorite photos of the July full "Buck Moon", which rose on July 29 to dazzle skywatchers as it marched across the summer sky.