The work is very relevant to Mars because we know the surface of Mars is as dead as a doornail and any life there -- if it exists -- would live underground.

Faith without works is as dead as a doornail.

My key aim is to get man on the surface of Mars by the mid-2030s.

We want to make sure we get living astronauts to the surface of Mars.

They stay in place and aren't slippery because they have a rough surface.

The only person of all the contestants I have shown a million to - and it's only relevant afterwards - who didn't even flinch was the Major because he knew he was going to play,