The dinosaurs were wiped out by an asteroid, but does that mean we risk suffering the same fate - and should you be worried about the possibility? Leah Crane sets the matter straight ...

NASA officials and planetary defense experts have been discussing a major gap in Earth’s asteroid detection efforts: a large number of medium-sized near-Earth asteroids remain undiscovered. Reports ...

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

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 ...

The National Aeronautics and Space Administration (NASA) has issued a stark warning about 15,000 “city-killer” asteroids that could strike Earth at any time, highlighting a significant gap in global ...

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

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

Once detected, there are plenty of narrow-field telescopes that can track the orbits of anything that looks alarming.

In a stark and widely reported warning, NASA’s planetary defence chief has revealed that Earth currently has no reliable way to stop thousands of “cit.

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's top planetary defense expert reveals the biggest threat isn't Hollywood-style doomsday rocks, but undiscovered 'city-killer' asteroids. While large and small threats are known, an estimated 25, ...