The Chandra X-ray Observatory, which has been observing the universe in high-energy light since 1999, entered a protective "safe mode" on Wednesday (Oct. 10).
Scientists have discovered another marker on the trail toward the putative Planet Nine — an extremely distant dwarf planet called 2015 TG387, and nicknamed 'The Goblin.'
An FBI investigation into child pornography caused the peculiar closure of a New Mexico solar observatory earlier this month, according to the news agency Reuters.
It's been more than a week, and a National Solar Observatory (NSO) facility in New Mexico is still closed for an undisclosed "security issue."
Astronomers used A.I. to find 72 more fast radio bursts, but they are still puzzled over what the flashes are.
Close encounters with medium-size black holes can reanimate dead stars, if only momentarily, a new study suggests.
Over the last four months, the U.S. Air Force has awarded two contracts for hypersonic weapons worth a maximum of $1.4 billion to aerospace giant Lockheed Martin.
Curiosity photographed an odd, flat object that mission team members initially thought might have fallen off the car-size robot. But the "debris" turned out to be a Red Planet rock.
A Russian satellite that launched to Earth orbit last October has been behaving oddly, raising the possibility that the craft could be some sort of space weapon, a U.S. diplomat warned.
The launch of NASA's $1.5 billion Parker Solar Probe atop a Delta IV Heavy rocket was spectacular. Here's what it was like to see it in person.
Astronauts aboard the International Space Station have taken dramatic new photos of the fires that are blackening huge swaths of the Golden State and throwing off smoke that billows far to the east.
Einstein's theory of general relativity has passed its most stringent test to date with flying colors, a new study reports.
A big sand dune blazes in an electric blue on the Red Planet in a gorgeous photo by NASA's Mars Reconnaissance Orbiter (MRO).
NASA's long-lived Opportunity Mars rover is weathering a monster dust storm that has plunged its environs into permanent darkness.
NASA's next exoplanet-hunting mission is scheduled to launch today (April 16) atop a SpaceX Falcon 9 rocket, and you can watch the action live.
SpaceX isn't responsible for the loss of the top-secret Zuma spy satellite during the craft's launch earlier this year, according to media reports.
Stephen Hawking will spend eternity in the company of some other tremendously influential English scientists.