Just what is the point of no return? German physicist, Karl Schwarzchild calculated the event horizon of black holes. And it can tell us more about the eventual fate of all the galaxies.

Transcript -- Life on Mars

Ever wondered where the Universe came from?  Or more importantly, where it's headed?  Voiced by David Mitchell, this series of 60 second animations examines different scientific concepts from the big bang to relativity, from black holes to dark matter.  The series also explores the possibility of life beyond Earth and considers why David Bowie is still none the wiser about life on Mars.