They killed the dinosaurs. They wrecked the Moon. And they've appeared in some truly awful movies. But now the United Nations has declared war on asteroids. It's about time, says Paul Parsons
If just one solar storm hit Earth it would wreck life as we know it. Our electricity supply and communications network would be destroyed, returning civilisation to the 18th century. Stuart Clark asks is there any way we can protect ourselves?
The Universe appeared from a cataclysmic explosion 13.7 billion years ago in which space, time and matter were all created. So is there any truth in the theory that universes and civilisations existed before our own? Robert Matthews investigates
This month:
Mars 2210
Science fiction author extraordinaire Stephen Baxter reckons we could have colonised the red planet in a few centuries time. We look at: Mining the Moon
Warp drive
Meeting the alien neighbours