An elliptical galaxy has spiral arms within it. The spiral arms formed shortly after a collision with another galaxy several hundred million years ago.
Researchers suggest the bright lights of cities, which are visible on a planet even from space, might reveal the existence of alien life on other planets.
Yay, several of you did take our challenge and spot the October 14, 2012 very old moon! Thank you, Peter Rodney Breaux, Lakshmi Ravishankar and Julie Gartman!
You will have to be outdoors very early in the morning - within an hour of sunup. You'll need a clear sky in the east, with no trees or tall buildings in the way.