Earth faces a significant threat from thousands of undetected asteroids capable of destroying cities. NASA's planetary defence chief warns that current systems cannot reliably stop these 'city-killers ...

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

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

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

NASA scientists recently expressed alarm over the potential threat posed by approximately 15,000 undetected asteroids capable of causing significant regional destruction. Currently, only 40 per cent ...

NASA planetary defense experts warn that up to 15,000 undetected asteroids could devastate a major city on Earth.

Imagine a rock the size of a football stadium hurtling through space at thousands of miles per hour, heading straight for a major city, and we have no way to stop it. NASA has just issued a sobering ...

NASA officials warn thousands of undetected “city killer” asteroids may be circling near Earth. With limited deflection tools ready, are we prepared if one suddenly shifts onto a collision course?

NASA's head of planetary defence, Dr Kelly Fast, has issued an unsettling update on thousands of ‘city-killer’ asteroids that could hit Earth.

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 ...

NASA experts are raising alarms about the growing threat posed bynear-Earth asteroids, with some of these objects having the ...

Space agencies maintain that global cooperation and sustained investment are vital to planetary defence. While the DART ...