The return of the factually-correct, but funny, exploration of the science and history of space travel, examining the Fermi paradox.

If the universe is really infinite, it should contain infinite life, and yet we have had no contact from alien civilisations.

Different ideas are examined through history of what life might be like on other planets.

Discover some of the more surprising suggestions scientists have had on how to get in touch - from giant burning parallelograms in the Sahara to sending nude pictures into space.

Written by Helen Keen and Miriam Underhill.

Starring:

Helen Keen
Peter Serafinowicz
Susy Kane

Producer: Garth Edwards.

First broadcast on BBC Radio 4 in May 2012. Show less