"For asteroids of the size scale relevant to planetary defense (i.e., ∼50-500 m), the mass can only be directly measured ...

The dinosaurs were wiped out by an asteroid, but does that mean we risk suffering the same fate - and should you be worried ...

She’s worried about the a-rock-alypse. A planetary defense expert is warning that humanity is defenseless against up to ...

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

NASA experts are raising alarms about the growing threat posed bynear-Earth asteroids, with some of these objects having the ...

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

Estimating a mass for a potentially hazardous asteroid (PHA) is perhaps the single most important thing to understand about ...

Scientists are raising serious alarms about hidden threats from space that could strike Earth without warning. NASA officials ...

Earth cannot defend itself against the thousands of “city killer” asteroids that are zooming around space near our planet, ...

An asteroid the size of a building could collide with the Moon in 2032 and generate a flash visible from Earth.

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