Sunset is a special time of day. Low-hanging clouds glow vivid red and orange as the background sky turns cobalt blue.
Black holes can be petite, with masses only about 10 times that of our sun -- or monstrous, boasting the equivalent in mass up to 10 billion suns.
Former Secretary of State Hillary Clinton has called the Benghazi terrorist attack, the most significant failure on her watch.
By analyzing the distinctive cracks lining the icy face of Europa, NASA scientists found evidence that this moon of Jupiter likely spun around a tilted axis at some point.
A newly discovered planet in a binary star system located 3,000 light-years from Earth
Wednesday was another key day for a challenge to the government's ability to indefinitely detain anyone under the laws of war.
The following video was declassified by the National Reconnaissance Office (NRO).
NASA spacecraft orbiting Mars have returned clues for understanding seasonal features that are the strongest indication of possible liquid water that may exist today on the Red Planet.
Throughout our universe, tucked inside galaxies far, far away, giant black holes are pairing up and merging.
President Barack Obama has signed HR 667, the congressional resolution that redesignates NASA's Hugh L. Dryden Flight Research Center as the Neil A. Armstrong Flight Research Center
An international team of scientists using a fleet of orbiting X-ray telescopes has discovered a millisecond pulsar with a dual identity.
NBC today announced an exclusive deal with Sir Richard Branson’s Virgin Galactic
Scientists from NASA and the Planetary Science Institute in Tucson, Ariz., have identified what could be a supervolcano on Mars—the first discovery of its kind.
Hillary Clinton was the planned keynote speaker at the 17th Annual Western Healthcare Leadership Academy in San Diego on April 11 - but she's cancelled her visit in the midst of planned protests
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