Will our land masses form one supercontinent 250 million years from now? Projections suggest that due to the shifting of Earth's plates, we'll once again return to this state, last seen in the Paleozoic era. The pictured map by C. R. Scotese (U. Texas at Arlington) shows the projected land mass, dubbed "Pangea Ultima." For more, check out Astronomy Picture of the Day(1).

1. http://antwrp.gsfc.nasa.gov/apod/ap070922.html