NASA may dream of sending humans to Mars in the coming decades, but the fact remains that nobody's really sure how we'll survive the journey or set up camp on the red planet.
The Orion spacecraft that will drive astronauts to Mars has a diameter that's about the length of a pickup truck. That's not a lot of space when you consider the astronauts' journey to Mars will take at least 6 months.
In order to not go totally bonkers, Mars-bound astronauts will need a larger place to live, complete with private quarters and exercise equipment. NASA envisions the Orion capsule could link up to a habitation module in space, but right now they have no idea what that module could look like. And who knows what the astronauts will live in once they get to Mars.