A Dutch company known as "Mars One" is hoping to begin colonization of the Red Planet by 2023.
The moon may be a harsh mistress, but Russian scientists say they want to establish a colony below the lunar surface.
SpaceX CEO Elon Musk believes the human race should aspire to colonize the solar system, rather than just making do with inhabiting planet Earth.
Acclaimed science fiction writer Ray Bradbury says he is mad at president Barack Obama.
Stephen Hawking believes humans must colonize additional planets or face mass extinction.