Nathaniel Iovinelli (left) and Ted Daisher join other supporters of same-sex marriage at a rally in Chicago to celebrate the Illinois General Assembly's passing of the gay marriage bill on Nov. 7. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

NASA's MAVEN, short for Mars Atmosphere and Volatile Evolution, with a capital "N" in EvolutioN, atop a United Launch Alliance Atlas V rocket, lifts off from Cape Canaveral Air Force Station, on Monday. John Raoux/AP hide caption

itoggle caption John Raoux/AP