More than 200,000 people signed up for the chance to live, and possibly die, on Mars as part of an ambitious plan to set up a human colony by 2023.

Now, about 1,000 applicants have been chosen to move forward in the process, including eventually undergoing rigorous physical and psychological evaluations.

The group will be whittled down to around 40, and training would begin in 2018 for the one-way trip.

A Dutch entrepreneur, Bas Lansdorp, has started the privately funded effort, saying he'll need $6 billion. NASA, however, says this type of project would require $100-200 billion and 20 years.

As Corey Powell of Discover Magazine told Bill Hemmer this morning, these space travelers will have to be willing to risk their lives for the Mars One project.

He explained that the whole thing will be "treated like a reality show," with much of the funding coming from broadcast rights to televise the launch and daily living on the Mars colony.

Powell added that much of the technology, including ways to combat radiation and how to land on Mars, is still far from being tested.