Buzz Aldrin: Mars Could Become Human Colony

One of the world's most famous astronauts believes that a human colony should be established on Mars. Edwin "Buzz" Aldrin became the second man to set foot on the Moon in 1969 and believes humans could touch down on the red planet by 2040. Dr Aldrin says an outpost on Mars would require people to live on the planet for long periods to set up a colony that would be fully self-sufficient.