NASA experts are raising alarms about the growing threat posed bynear-Earth asteroids, with some of these objects having the potential to cause devastating damage to cities. While some large asteroids ...

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

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

Astronomers do not know where thousands of “city-killer” asteroids are, Nasa’s head of planetary defence has admitted.

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

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

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

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?

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 ...

EARTH cannot defend itself against the thousands of “city killer” asteroids that are zooming around space near our planet, Nasa chiefs warn. They reckon there are about 15,000 undetected ...

Around 15,000 mid-sized asteroids, known as 'city-killers', are unaccounted for as they zoom around space close to planet ...

It's a bird. It's a plane. It's a skyscraper ... or at least, it's something as big as those things. Several large asteroids are set to pass by Earth this week, according to NASA's Jet Propulsion ...