The Messenger spacecraft is depicted over the Calvino Crater on Mercury in this enhanced-color image of the planet's surface. NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington hide caption

itoggle caption NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Russia's unmanned Progress space freighter, headed for the International Space Station, blasts off from the Baikonur Cosmodrome in Kazakhstan, Oct. 30, 2011. A string of mission failures has raised concerns over the reliability of Russia's space program. STR/Reuters /Landov hide caption

itoggle caption STR/Reuters /Landov

The sun-orbiting SOHO spacecraft captured this image of filaments erupting off the sun's surface and magnetic plasma blasting into space. The field of view of this image, seen in ultraviolet light, extends some 1.243 million miles from the solar surface. NASA/JPL hide caption

itoggle caption NASA/JPL

This image of a huge and powerful solar flare was captured by NASA's Solar Dynamics Observatory Tuesday. NASA hide caption

itoggle caption NASA

One of Ruben Garcia's favorite spots to go meteorite hunting is an enormous dry lake bed in southern Arizona. Courtesy Jana Becker hide caption

itoggle caption Courtesy Jana Becker