Dr Michio Kaku draws up ambitious plans for the construction of a new solar system. Details involve a giant shell encircling a star, with a new stellar civilisation living on the inside.

The aliens are coming! It is the cry at the heart of many sci-fi movies, but what would we do if an alien race really did invade? Earth must be prepared - and Dr Kaku has a plan.

Dr Michio Kaku is on a quest to make the first contact with extraterrestrial life; with multitudes of planets in and outside of our Milky Way galaxy, experts believe it is only a matter of time before the first contact takes place.