This instructional activity will help students understand impact craters and infer how they were formed and the reason for their differences in size.

On May 2, 2006, a meteoroid hit the moon with a force equivalent to four tons of TNT. The event was captured on a 10-inch telescope equipped with a video camera. The video was then played in slow motion in order to be visible by the...

This Astronomy Picture of the Day is of Crater Copernicus, taken by the Apollo 17 crew in 1972.