Space shuttle Endeavour is carried on one of NASA’s modified Boeing 747 Shuttle Carrier Aircraft on a ferry flight back to the Kennedy Space Center in Florida after its last landing at Edwards Air Force Base in November 2008.
Cassini image of Titan. Credit: NASA/JPL-Caltech/Space Science Institute
As the sun sets over South America, the layers of Earth’s atmosphere along the horizon—or limb—go from bright white to deep blue, as seen on April 12 by an astronaut aboard the International Space Station.
The change from day to night is marked by an ever-shifting boundary called the terminator, seen in the above image crossing central South America. The Salar de Coipasa, a large salt lake in Bolivia, is dimly visible on the night side of the terminator.
Photograph courtesy of NASA
Photo: Bathed in xenon lights, space shuttle Endeavour moves along the crawlerway from the Vehicle Assembly Building to Launch Pad 39A at NASA’s Kennedy Space Center in Florida. Riding atop a crawler-transporter attached to its external fuel tank and solid rocket boosters, Endeavour’s last scheduled 3.4-mile trek to the pad, known as “rollout,” took just less than eight hours. (NASA/Terry Zaperac)