NASA's Swift observatory has made its last observation after a robotic rescue failed, and atmospheric drag will pull it down within weeks. It leaves behind more ...

The Mystery of Stellar Remnants For years, astronomers have known that most stars in our galaxy, the Milky Way, are not lone ...

NASA’s Neil Gehrels Swift Observatory has ended its scientific mission because the spacecraft is now orbiting less than 171 ...

A Japanese spacecraft is on its way to study Mars' 2 moons. But that's not all: It will also attempt to bring a piece of Phobos back to Earth.

These cataclysmic explosions spray intense radiation and beams of energy through the universe at close to the speed of light.

Japan launched a $578 million mission Monday on a five-year expedition to land on the largest moon of Mars and retrieve ...

Pulsars are rapidly rotating neutron stars, the extremely dense cores left behind when massive stars explode. Astrophysicists ...

NIST-developed transition-edge sensors measured interfering X-ray emissions from uranium, plutonium and neptunium with ...

The APL-developed MEGANE spectrometer will help scientists investigate the origins of the Red Planet’s small potato-shaped ...

It’s difficult to imagine a more daunting journey than one to an alien moon named after the Greek god of fear—especially when three other attempts to make that journey have failed. And yet, as Japan’s ...

TOKYO — Japan is set to launch a spacecraft on the world’s first mission to bring back samples from Phobos, one of the two small, potato-shaped moons orbiting Mars. Scientists hope the mission, which ...

A Japanese-led mission has launched to explore Mars’ two mysterious little moons and determine how they formed — and unlock ...