While some large asteroids are monitored and their movements tracked, there’s a significant concern over the 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.

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

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

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

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

NASA experts warned that human beings are vulnerable to thousands of hidden “city-killer” asteroids. A new space telescope ...

The asteroid, around 100 feet in diameter, is speeding toward our planet at about 22,000 miles per hour, according to NASA.

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 ...

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

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 ...