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 ...

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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.

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

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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 ...

A NASA planetary expert has revealed that humankind has no way to protect against a city-killer asteroid if it were to head ...

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 ...