On the world's first Asteroid Day, Nina Burleigh discovers that Nasa has already commissioned a team of 'planetary defenders' ...

Even the smallest odds of an impact sound alarming, but scientists’ ability to calculate them is actually good news.

Astrophysicists have long theorized that there should be planets out there that are, in size, somewhere between Earth and ...

Engaging articles, breathtaking images and expert knowledge Issues delivered straight to your door What would happen if Earth ...

Here are today's general risks from asteroids or comets both tiny and very large. Importantly, even relatively small rocks ...