The Carina Nebula: star birth in the extreme. Two telescopes, the Hubble and the Cerro Tololo Inter-American Observatory in Chile were used to make this image. Credit: NASA, ESA, N. Smith [University of California, Berkeley], The Hubble Heritage Team [STScI/AURA], N. Smith [University of California, Berkeley] and NOAO/AURA/NSF.
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.