She’s worried about the a-rock-alypse. A planetary defense expert is warning that humanity is defenseless against up to 15,000 undetected near-Earth asteroids that have the potential to take out a ...

"We don’t know where they are,” said NASA’s planetary defense officer Kelly Fast at the AAAS conference in Arizona this week.

A NASA planetary defense officer warns thousands of near-Earth asteroids capable of destroying a city remain undetected.

Earth cannot defend itself against the thousands of “city killer” asteroids that are zooming around space near our planet, ...

NASA has made an alarming admission, revealing it has no idea where thousands of ginormous asteroids are currently located. The space rocks have terrifyingly been dubbed 'city killers' due to their ...

“What keeps me up at night is the asteroids we don’t know about," said NASA's planetary defense chief.

A NASA scientist has warned that thousands of city-killing asteroids could strike Earth, and there’s currently no defense humanity could use to stop them.

Scientists discussed the threat of asteroids at a recent conference in Phoenix. Here's what they said.

A new study analyzes three asteroid and two meteorite samples to see if space rocks smacking into Earth could’ve helped ...

Blasting meteorite samples with CERN’s Super Proton Synchrotron, the team found that the material "became stronger". That might not be bad news.

While the technology still needs significant work, a new analysis of meteorites points to valuable targets in the solar ...