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This dramatic view was captured as the spacecraft's highly elliptical orbit positioned MESSENGER high above Mercury's southern hemisphere. NASA hide caption
Worker holds up a cantaloupe for sale Ed Andrieski/AP hide caption
Penetrator bombs, commonly known as bunker busters, are stored on pallets at an ammunition plant in McAlester, Okla., in 2002. The U.S. sold 55 bunker busters to Israel in 2009, according to a recent Newsweek report. Sue Ogrocki/AP hide caption
The main ring of the Tevatron, seen in a time exposure. For a quarter century, the particle accelerator at a lab outside Chicago was the most powerful machine of its kind in the world. Reidar Hahn/Fermilab hide caption
Abdel Hakim Belhaj (center left), a prominent militia commander, walks with Transitional National Council Chairman Mustafa Abdel Jalil in Tripoli on Sept. 10. The battle to oust Moammar Gadhafi produced a number of leaders who will have to work together to form a new government. Francois Mori/AP hide caption
Ryan Witmer (left) and Jhonmar Castillo wait with other couples to exchange vows in a civil union ceremony June 2 in Chicago's Millennium Park. New data from the U.S. census may reveal as much about changing attitudes as about changing numbers. Scott Olson/Getty Images hide caption
German Chancellor Angela Merkel leaves the Lower House of German parliament Bundestag in Berlin after a vote on legislation to expand the EU's rescue fund. Michael Kappeller/AFP/Getty Images hide caption
Then-Sen. Barack Obama drew enthusiastic crowds at a rally in Columbus, Ohio, just days before the 2008 election. Now, after a few rocky moments with the coalition that helped send him to the White House, and with a re-election battle looming, Obama is trying to re-energize his supporters. Joe Raedle/Getty Images hide caption