All life on Earth, including humans, comes from outer space - every single molecule of our bodies originated from an unimaginably large hydrogen cloud created by the Big Bang - and there are even serious claims that life was carried to earth by meteors.

Sam Neill takes us on a rollercoaster ride through the galaxy to discover how disasters in space regularly threaten our entire world. We go back to the very earliest days of our planet to see why we are lucky life ever got started, and we learn just what will happen if a massive asteroid ends up on a collision course with Earth.

Even if we avoid destruction by asteroids, we face eventual melt-down, as our Sun is getting progressively hotter. New Worlds looks at where we could go to escape this fate and talks to scientists who are already exploring how we could turn a planet like Mars into a Noah's ark for the earth's animal and plant life. It may even be that humans have to change themselves genetically to survive.