Moonless nights outside the Cerro Tololo astronomical observatory in Chile are so dark that when you look down, you can't see your feet. "You can't see your hands," said a physicist. "But you can hold them up to the sky and see a hand-shaped hole with no stars in it. It's really incredible."
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/T...
Fuente : http://feeds.sciencedaily.com/~r/sciencedaily/~3/T...