View of the central portion of the Whirlpool Galaxy, M51. Credit: NASA, ESA, W. Li and A. Filippenko [University of California, Berkeley], S. Beckwith [STScI], and The Hubble Heritage Team [STScI/AURA].
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.