The SpaceX Dragon is the first commercially developed vehicle to be sent to the International Space Station. The successful mission that ended Thursday represents NASA's future of space travel. (Associated Press)
This frame grab image from NASA-TV shows the SpaceX Dragon capsule, center, the U.S. Destiny lab, left and the Japanese Kibo module, right just after the Dragon capsule was dematted from the International Space Station Thursday, May 31, 2012. (AP Photo/NASA)
This image provided by NASA-TV shows the SpaceX Dragon commercial cargo craft (top) as it approaches the International Space Station on May 25, 2012. Dragon is scheduled to spend about a week docked with the station before returning to Earth on May 31 for retrieval. (Associated Press/NASA)
This image provided by NASA-TV shows the SpaceX Dragon commercial cargo craft as it flies over the coast of West Africa taken from Canadarm2's video camera as Dragon approaches the International Space Station early May 25, 2012. In foreground is a portion of Canadarm2. (Associated Press/NASA)
The Falcon 9 rocket cut a fiery arc through the darkness when it lifted off just before 4 a.m. Tuesday and boosted an unmanned capsule into orbit. Financed by a billionaire businessman, the ship will deliver supplies to the International Space Station. The launch marked the first time a commercial spacecraft has been sent to the outpost. (Associated Press)
The SpaceX Falcon 9 rocket, seen after a 2010 launch, is set to head to the International Space Station on Saturday with a payload of supplies. The rocket will be unmanned. (Associated Press)
Sen. John Glenn talks Feb. 20, 2012, via satellite with the astronauts on the International Space Station before the start of a roundtable discussion titled "Learning from the Past to Innovate for the Future" in Columbus, Ohio. (Associated Press)
An image provided by NASA shows Hurricane Irene as photographed from onboard the International Space Station at 3:14 p.m. EDT on Aug. 24, 20ll. The image, captured with a 38 mm lens, reveals the eye of the storm at center of the frame. (AP Photo/NASA)
ASSOCIATED PRESS
This image provided by NASA shows a view of Space Shuttle Atlantis while still docked with the International Space Station taken by crew member Mike Fossum aboard the station Monday. The robotic arm on the shuttle appears to be saluting "goodbye." Earth's airglow is seen as a thin line above Earth's horizon.
The space shuttle Atlantis, with the Earth behind it, still is docked to the International Space Station early on Tuesday, July 18, 2011, in this image made from NASA TV. (AP Photo/NASA)
This panoramic view provided by NASA was photographed from the International Space Station, looking toward Earth past the cargo bay of the docked space shuttle Atlantis and part of the station, including a solar array panel, on Thursday, July 14, 2011, as the complex passed over the Southern Hemisphere. The Aurora Australis, or Southern Lights, can be seen on Earth's horizon, and a number of stars also are visible. (AP Photo/NASA)
ASSOCIATED PRESS
Astronauts Ronald Garan Jr. (top) and Michael Fossum work outside the International Space Station during the last spacewalk of NASA's space- shuttle era on Tuesday. They retrieved a broken ammonia pump.