Killers Of The Cosmos

A single rock wiped out the dinosaurs -- does the same fate await humans?

Black holes were only theoretical until recently. And there are probably millions of them in the galaxy. Worse still, some are rogue, speeding through space with the potential to destroy Earth.

Radiation from a massive star's death could obliterate life on Earth.

A collision of space debris could cause a global communication meltdown.

There are hundreds of billions of planets out there. Maybe aliens exist, but humans just haven't found them yet. They might even be killers who want to invade and plunder Earth, threatening human life.

Everything comes to an end, even a universe. So, how will it all end? Will gravity make it collapse, or will it expand forever? And now there's a third alternative; dark energy is a mysterious impulse that could tear the very fabric of the universe apart.