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A collision of two galaxies has left a merged star system with an unusual appearance as well as bizarre internal motions

This panorama mosaic, taken by the Surface Stereo Imager on board NASA's Phoenix Mars Lander, documents the passage of the midnight sun over several days. The foreground and sky images were taken on Sol 54, or the 54th Martian day of the mission (July 20, 2008)

Awaiting orders to proceed to the launch site for Project Mercury's second attempt to launch a man into space, astronaut Virgil I

On May 25, 1961, President John F

California Gov

On July 17, 1975, something momentous happened: two Cold War-rivals met in space

STS-124 commander Mark E

Lightning triggered a complex of forest fires in Northern California?s Klamath National Forest on June 21, 2008

This image, taken by the Surface Stereo Imager on NASA's Phoenix Mars Lander, shows the lander's robotic arm scoop positioned over the Wet Chemistry Lab Cell 1 delivery funnel on July 6, 2008, or Sol 41, the 42nd Martian day after landing. The instrument's Cell 1 is second one from the foreground of the image

Attired in his Russian Orlan spacesuit, Russian Federal Space Agency cosmonaut Oleg Kononenko, Expedition 17 flight engineer, prepared for the July 10 spacewalk

Technicians at NASA Ames Research Center are reflected in the coated SOFIA telescope main mirror suspended above them

A backhoe is used during repair work under way on the flame trench on Launch Pad 39A at NASA's Kennedy Space Center

Norilsk, a major city in Krasnoyarsk Krai, Russia, and the northernmost city in Siberia, was founded in the 1930s as a settlement for the Norilsk mining-metallurgic complex, sitting near the largest nickel-copper-palladium deposits on Earth

An adult bald eagle rests near a pond at NASA's Kennedy Space Center

This image was acquired by NASA's Phoenix Mars Lander's Surface Stereo Imager (SSI) in the late afternoon of the 30th Martian day of the mission, or Sol 30 (June 25, 2008), hours after the beginning of Martian northern summer

Visitors to the National Mall get an up close and personal view of the space shuttle's main engine thanks to the display provided by the Stennis Space Center

The 42nd Annual Smithsonian Folklife Festival on the National Mall in Washington, D.C

Nils Larson from NASA's Dryden Flight Research Center shows a high altitude pressure suit, complete with whiffle ball on the end of a draw string at the the 42nd Annual Smithsonian Folklife Festival. This year, NASA is honored to be one of three featured programs

Reminiscent of a fireworks celebration, this Hubble Space Telescope image of a cosmic explosion that is quite similar to fireworks on Earth

Reminiscent of a fireworks celebration, this Hubble Space Telescope image of a cosmic explosion that is quite similar to fireworks on Earth