How the Universe Works - Season 4 (2015)

Giant magnetic bubbles millions of miles wide, bizarre invisible matter, and a death star tearing through bands of icy comets, flinging them into violent orbits. All this and more could be inside our cosmic backyard, and effecting our lives on Earth.

We're on the verge of unconvering the how life on Earth came to be. Our origin is a hotly contested scientific debate. Did we come from strange volcanic hatcheries deep under the sea? Or did life on Earth come from another planet?

Our Moon is stranger than you think, and we reveal its incredible secrets. Can we thank the Moon for life on Earth? What explains the mysterious tunnels beneath its surface? Is a lunar base the key to humanity's future in space?

For years, scientists suspected that the oceans came from molecules delivered to Earth from distant stars by asteroids, but a new discovery suggests that their true origins may be more exotic.

There's a mysterious force you can't see or touch, but it affects everything in the universe. Magnetism has shaped our cosmos, and without it, Creation would simply disintegrate. We follow scientists trying to understand how this strange force works.