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

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's OSIRIS-REx mission is scheduled to return samples of Asteroid Bennu to Earth. Credit: NASA Goddard Space Flight Center ...

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

NASA warns 15,000 mid-sized "city-killer" asteroids remain undetected. DART proved asteroid deflection possible, but no spacecraft currently capable of deflecting an asteroid.

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

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 ...

Around 15,000 mid-sized asteroids, known as 'city-killers', are unaccounted for as they zoom around space close to planet Earth - with the potential to cause devastating damage ...

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 ...

A top astronomer responsible for defending the Earth against asteroids has revealed what keeps her up at night — thousands of “city killer” space rocks that remain undetected. Dr Kelly Fast, NASA’s ...

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 ...