Dr Kevin Fong offers a guide through the ethical, technical and scientific challenges of attempting to send astronauts to Mars. Costing billions of dollars, and the lives of those brave enough to attempt it, Kevin asks if the possible benefits are really worth the risk?

Production:  BBC
Director & Producer:  Alex Hemingway
Executive Producer:  Jonathan Renouf
Executive Producer:  Zoe Heron
Editing / Vfx:  Jon Coutts