Black Hole-Powered Jet of Electrons and Sub-Atomic Particles Streams From Center of Galaxy M87. Credit: NASA 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.