For the first time ever, scientists have uncovered a vast field of tektites in Brazil — mysterious glassy fragments forged when a powerful extraterrestrial object slammed into Earth about 6.3 million ...

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

On 14 February 2026, at the American Association for the Advancement of Science annual meeting in Phoenix, Arizona, Kelly Fast presented data on a persistent gap in planetary defense capabilities.

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

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

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 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 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 ...

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.

The object is hurtling towards the Earth at a zippy 12,616 miles per hour, according to data from the space agency.

NASA scientists recently expressed alarm over the potential threat posed by approximately 15,000 undetected asteroids capable ...

NASA has warned that about 15,000 mid-sized “city-killer” asteroids near Earth remain undiscovered, with the potential to cause regional devastation, as scientists say no deflection mission is ready ...