Space around the Sun contains far more than planets. Scattered through it are smaller bodies made of rock, metal, ice and ...

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

Scientists classify asteroids measuring 140 metres or more as "city-killers" because of the scale of destruction they can unleash ...

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.

NASA warns 15,000 mid-sized "city-killer" asteroids remain undetected. DART proved asteroid deflection possible, but no ...

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

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

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

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

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