One of NASA's two stuck astronauts got a much welcomed change of scenery Thursday, stepping out on her first spacewalk since ...

NASA astronaut Don Pettit has snapped a striking shot of the super-bright comet racing past our planet for the first time in 160,000 years, as it lit up the night skies across the globe.

Rare blue lurker star found in the M67 open star cluster Unusual rotation speed linked to stellar mergers in a triple system ...

Edwin Hubble's discovery of the expanding universe transformed cosmology, revealing countless galaxies and laying the ...