Nucleus of Galaxy Centaurus A, NGC 5128. The blue clusters in this image are newly born stars. Credit: E.J. Schreier [STScI], and 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.