From asteroid belt to Oort Cloud, C/2014 S3 may be an important relic of the early solar system.
The XMM-Newton satellite has discovered gas streaming away at a quarter of the speed of light from bright X-ray binaries in two nearby galaxies.
NASA's Fermi Gamma-Ray Space Telescope helped astronomers connect a blazar's outburst to Big Bird, one of the most powerful neutrino events ever detected.
A giant star that exploded 30 million years ago in a galaxy near Earth had a radius prior to going supernova that was 200 times larger than our sun, according to astrophysicists at Southern Methodist University, Dallas.
The sudden blast hurled material outward from the star at a speed of 10,000 kilometers a second. That's equivalent to 36 million kilometers an hour or 22.4 million miles an hour, said SMU physicist Govinda Dhungana, lead author on the new analysis.
The comprehensive analysis of t
In a tweet, the company says it's prepared to send a Dragon to Mars within the decade.
NASA's Curiosity Mars rover has nearly finished crossing a stretch of the most rugged and difficult-to-navigate terrain encountered during the mission's 44 months on Mars.
The rover climbed onto the Naukluft Plateau of lower Mount Sharp in early March after spending several weeks investigating sand dunes. The plateau's sandstone bedrock has been carved by eons of wind erosion into ridges and knobs. The path of about a quarter mile (400 meters) westward across it is taking Curiosity toward smooth
Saturn's largest moon is covered in seas and lakes of liquid hydrocarbons – and one sea has now been found to be filled with pure methane, with a seabed covered by a sludge of organic-rich material, and possibly surrounded by wetlands.
Of all the moons in the Solar System, Titan is the only one with a thick atmosphere and large liquid reservoirs on its surface – in some ways making it more like a planet such as Earth. Both Earth and Titan have atmospheres dominated by nitrogen, mor
Once a lonely ice block, now it seems the dwarf planet may have a close-in companion.