Sagittarius A

New evidence suggests that a super-massive black hole exists at the center of our galaxy. Chinese researchers observed radio waves emitted from the edge of the object that they are calling Sagittarius A. If this evidence proves to be correct, future research could lead to a true test of Einstein's general theory of relativity. Nifty!

animated gifs from Library of Congress photos

Kevin J Wier makes animated gifs using old photographs from the library of congress flickr account. ...