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This long-exposure Hubble Space Telescope image of massive galaxy cluster Abell 2744 (foreground) is the deepest ever made of any cluster of...

This stunning false-color view spans about 40 light-years across the region, constructed using infrared data from the Spitzer Space Telescop...

This photograph shows Neil Armstrong next to the X-15 rocket-powered aircraft after a research flight. He was one of only 12 pilots to fly t...

On Dec. 24, 2013, NASA astronaut Mike Hopkins, Expedition 38 Flight Engineer, participates in the second of two spacewalks, spread over a fo...

The Apollo 8 mission's impressive list of firsts includes: the first humans to journey to the Earth's Moon, the first to fly using the Satu...