Has the universe always existed? How did it become a place that could harbour life? And, since it can, how likely is it that in its infinite expanse we might be truly alone? NOVA sets out to explore the mysteries of space.

Astrophysicist Dr Tyson boldly goes in search of life on other worlds. Exploring such provocative questions as: would 'ETs' resemble us or the creatures of science fiction? And, with the recent discovery of planets outside our solar system, he asks: are worlds which could sustain life rare or common in our universe?

Film Duration: 49 min