NASA estimates that roughly 25,000 near-Earth asteroids measuring at least 140 meters across orbit in our planetary neighborhood, but surveys have so far cataloged only about 40% of them. That gap ...

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

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 ...

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

A planetary defense expert working for NASA warned that humanity has no defense against up to 15,000 undetected near-Earth asteroids that could wipe out a city.

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

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

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

Humanity needs to step up its asteroid-hunting game. To date, astronomers have spotted more than 8,000 near-Earth asteroids that are at least 460 feet (140 meters) wide — big enough to wipe out an ...

Thousands of “city killer” asteroids remain undetected, NASA warns, and no ready spacecraft exists to stop one. A recent close call exposed gaps that scientists say still leave Earth vulnerable.