A small model of the Glory earth-observing spacecraft is seen during a news conference at NASA Headquarters, Thursday, Jan. 20, 2011, in Washington. NASA's newest Earth-observing research mission is scheduled for launch form Vandenburg Air Force Base in California on Feb. 23. The mission will improve our understanding of how the sun and tiny atmosppheric particles called aerosols affect Earth's climate. Photo Credit: (NASA/Paul E. Alers)