'Waterworld' planet six times the size of Earth discovered - Telegraph
April 6, 2012 at 5:19:34 PM GMT+2 * - permalink -

- http://www.telegraph.co.uk/science/space/6826763/Waterworld-planet-six-times-the-size-of-Earth-discovered.html

Observable universe - Wikipedia, the free encyclopedia
April 6, 2012 at 5:18:11 PM GMT+2 * - permalink -

- http://en.wikipedia.org/wiki/Observable_universe

Martian landscapes - The Big Picture - Boston.com
April 6, 2012 at 5:14:33 PM GMT+2 * - permalink -

- http://www.boston.com/bigpicture/2009/11/martian_landscapes.html