Earth faces a significant threat from thousands of undetected asteroids capable of destroying cities. NASA's planetary defence chief warns that current systems cannot reliably stop these 'city-killers ...

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 ...

NASA planetary defense experts report that mid-size near-Earth asteroids could cause regional damage, with detection and deflection remaining limited, according to New York Post and AAAS reports.

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

On 14 February 2026, at the American Association for the Advancement of Science annual meeting in Phoenix, Arizona, Kelly ...

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.

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

“What keeps me up at night is the asteroids we don’t know about," said NASA's planetary defense chief.

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?

NASA experts warned that human beings are vulnerable to thousands of hidden “city-killer” asteroids. A new space telescope may improve detection, but we currently lack tools to stop a threat.

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.

NASA officials warn that around 15,000 'city-killer' asteroids remain undiscovered, many lurking in a stubborn observational blind spot near the sun.