A hot air balloon passes over the campus of the 2011 Green Flight Challenge, sponsored by Google, at the Charles M. Schulz Sonoma County Airport in Santa Rosa, Calif. on Thursday, Sept. 29, 2011. NASA and the Comparative Aircraft Flight Efficiency (CAFE) Foundation are having the challenge with the goal to advance technologies in fuel efficiency and reduced emissions with cleaner renewable fuels and electric aircraft. Photo Credit: (NASA/Bill Ingalls)

A hot air balloons pass over the campus of the 2011 Green Flight Challenge, sponsored by Google, at the Charles M. Schulz Sonoma County Airport in Santa Rosa, Calif. on Thursday, Sept. 29, 2011. NASA and the Comparative Aircraft Flight Efficiency (CAFE) Foundation are having the challenge with the goal to advance technologies in fuel efficiency and reduced emissions with cleaner renewable fuels and electric aircraft. Photo Credit: (NASA/Bill Ingalls)

A hot air balloon passes over the campus of the 2011 Green Flight Challenge, sponsored by Google, at the Charles M. Schulz Sonoma County Airport in Santa Rosa, Calif. on Thursday, Sept. 29, 2011. NASA and the Comparative Aircraft Flight Efficiency (CAFE) Foundation are having the challenge with the goal to advance technologies in fuel efficiency and reduced emissions with cleaner renewable fuels and electric aircraft. Photo Credit: (NASA/Bill Ingalls)

KENNEDY SPACE CENTER, FLA. - This front view of the Super Guppy aircraft, parked on NASA Kennedy Space Center’s Shuttle Landing Facility, appears more like a hot air balloon. In fact, it is the bulbous nose which, when unhinged, can open more than 200 degrees and allow large pieces of cargo to be loaded and unloaded from the front. The aircraft has flown to the Center to pick up and transport the common module structural test element to NASA's Marshall Space Flight Center in Huntsville, Ala. The common module is an aluminum canister used as a structural test element for an actual Space Station flight element. At Marshall, the module will be used to conduct advanced environmental control and life support testing for future NASA exploration missions. Guppy aircraft were used in several past space programs, including Gemini, Apollo and Skylab, to transport spacecraft components. NASA personnel at Ellington Field in Texas outfitted the Super Guppy with a specially designed cradle to be used when carrying International Space Station components. The first Guppy aircraft was developed in 1962, designed specifically for NASA operations by Aero Spacelines of California. Photo credit: NASA/Kim Shiflett