Sorry, this episode is not currently available

The Grand Collision

In two billion years' time our own Milky Way will collide with another galaxy, Andromeda. This cataclysmic event will rip apart the fabric of both galaxies, destroying stars and planets and sparking a shockwave of fiery rebirth. Eventually it will create new stars, solar systems and planets. Sir Patrick Moore anticipates this far-off event and explains the role that dark matter will play in this cosmic collision.

20 minutes

Last on

Mon 5 Nov 2007 01:40
BBC One Wales

Join our photo group

Starscape by Kev Lewis

Share images, inspiration and tips with fellow photographers