This photograph represents an instant in time as recorded by the Galileo spacecraft. The Earth and Moon scene appeared on a single frame at a distance of about 2.9 million miles. Toward the bottom of the Moon, the indentation into the bright half is the Aiken Basin. It is believed to be one of the oldest and largest lunar impacts. Credit: NASA.
Why does a returning boomerang come back?
When most of us think of boomerangs, we imagine somebody throwing a curved stick that eventually turns around and comes right back to the thrower's hand. This device is simply amazing, and a wonderful application of some laws of physics relating to aerodynamic lift and angular momentum.