

The Space Shuttle Endeavour rests atop NASA's Shuttle Carrier Aircraft in the Mate-Demate Device (MDD) at the Ames-Dryden Flight Research Facility, in Edwards, California, shortly before being ferried back to the Kennedy Space Center, Florida.
Earth's limb – the point at which the edge of the atmosphere meets the blackness of space – was photographed at sunset by one of the STS-114 crewmembers through a window on the Space Shuttle Discovery. NASA
The Expedition 27 crew photographed this sunset over western South America from aboard the International Space Station. The station crew sees, on average, 16 sunrises and sunsets during a 24-hour orbital period. Each changeover between day and night on the ground is marked by the terminator, the line separating the sunlit side of Earth from the side in darkness.
A Space Shuttle lands at NASA's Dryden Flight Research Center, in Edwards, Calif. in 1989.
The setting sun and the thin blue airglow line at Earth's horizon was captured by the International Space Station's Expedition Three crewmembers with a digital camera. Some of the station's components are silhouetted in the foreground. The crew was launched aboard the Space Shuttle Orbiter Discovery STS-105 mission, on August 10, 2001, replacing the Expedition Two crew.
This awesome image depicts the full moon, sunset launch of the Space Shuttle Orbiter Atlantis STS-98 mission on Feb. 7, 2001. The large white plume is the pillar of smoke and stream left behind by the solid rocket boosters. The very bright dot that exists above the plume is the flame still visible at the base of the rocket boosters.
The darkening sky at sunset provides a dramatic backdrop for Space Shuttle Atlantis on Launch Pad 39A. Spectators (bottom) wait for the rollback of the Rotating Service Structure to reveal the orbiter. In the photo only the orange external tank and white solid rocket booster are visible.
Space Shuttle Discovery lit up the sky at sunset as it roared off Launch Pad 39A at NASA's Kennedy Space Center on its mission to the International Space Station. The STS-119 mission is the 28th to the space station and Discovery's 36th flight.
Boeing Phantom Works has partnered with NASA and the Air Force Research Laboratory to study the structural, aerodynamic and operational advantages of the Blended-Wing Body advanced aircraft concept, a cross between a conventional plane and a flying wing design. The Air Force has designated the prototype the X-48B based on its interest in the design's potential as a multi-role, long-range, high-capacity military transport aircraft. The craft shows off its unique lines at sunset on Rogers Dry Lake adjacent to NASA's Dryden Flight Research Center, at sunset.
A sunset silhouette of the Taurus XL rocket with NASA's OCO satellite aboard sits poised for launch on Launch Complex 576-E at Vandenberg Air Force Base in California.
This view of the rising Earth greeted the Apollo 8 astronauts as they came from behind the Moon after the lunar orbit insertion burn. Earth is about five degrees above the horizon in the photo. The unnamed surface features in the foreground are near the eastern limb of the Moon as viewed from Earth. On the Earth 240,000 miles away, the sunset terminator bisects Africa.
Earth's limb at sunset is photographed by one of the Expedition Two crew members with a digital still camera aimed through the nadir window of the US laboratory Destiny. Beneath the limb, a large mass of clouds fills the window.
This orbital sunset was photographed by Astronaut John H. Glenn Jr. aboard the 'Friendship 7' during his Mercury-Atlas 6 (MA-6) flight.
STS-55 Earth observation taken aboard Columbia, Orbiter Vehicle 102, shows a spectacular sunset view over South America and the cleanest atmosphere since before the volcanic eruptions of 1991, according to NASA scientists studying the STS-55 photography. A dark cloud layer is evident at an altitude of 7 to 9 kilometers.