An asteroid named Florence that will safely sweep past Earth on Sept. 1 is the largest object to give our planet a close shave since NASA began tracking these types of near-Earth asteroids, an agency official said.

The well-preserved remains offer a glimpse into the rapidly shifting world that surrounded Naia, a girl who died around 13,000 years ago.

Scientists searching the cosmos for signs of intelligent alien life pick up the only known repeating "fast radio bursts" again and are asking others to tune in too.

Stem cells are amazing. They hold the potential to repair almost any part of the body, shifting into different cell types on demand. But that doesn't mean you can trust all the treatment pitches out there with "stem cells" in the description - often these…

Three crewmembers safely returned to Earth from the International Space Station today (Sept. 2) as their Soyuz MS-04 spacecraft touched down in Kazakhstan at 9:22 p.m. EDT (0122 GMT on Sept. 3).

Light is pretty awesome. It's made of subatomic particles called photons, which also behave like waves. It's been demonstrated to act like both a particle and a wave simultaneously. Photons can be entangled at a distance. They reflect, refract and diffract.…

North Korea is believed to have conducted a hydrogen bomb test . Seismic shockwaves from the underground test were felt in China, and quickly detected by both South Korea and Japan – both independently confirmed it was a nuclear test.

Perhaps among all clean energy alternatives, nothing can be as clean as hydrogen. Burning hydrogen in fuel cells produces only water as a byproduct. In that sense, it's also truly renewable. Yet, manufacturing hydrogen fuel cells on a larger scale hasn't…