4 out 4,000 selected to live in Mars-like simulation at Johnson Space Center for 1 year

HOUSTON, Texas -- Starting Sunday night, a team of four volunteers will spend the next year inside a 1,700 square foot 3-D printed habitat at Johnson Space Center.

The team is simulating what it would be like to live on the planet Mars, and they started their adventure just after 6:30 p.m. Houston time.

So, what's this for?

Four intrepid scientists began their year-long mission, living as if on Mars so that the National Aeronautics and Space Administration, or NASA, could learn about how humans would fare during extended space travel.

Among the challenges to rehearse? The distance between the planets-which averages roughly 140 million miles.

"When we go to Mars someday, there's going to be up to a 22-minute delay each way," Dr. Suzanne Bell, a Behavior Health and Performance Laboratory lead at Johnson Space Center, said.

RELATED: NASA Mars habitat allows scientists to study 4-man astronaut crew before 2030s flights

"So Mission Control won't even hear about a problem until 22 minutes after it's occurred. This requires the crew to work with unparalleled levels of autonomy, and they'll have to problem solve on their own," she said. "They'll have to determine what they elevate back to Mission Control and wait 44 minutes for the response. And so that's exactly one of the things we're trying to replicate."

The experiment is called CHAPEA, which stands for Crew Health and Performance Exploration Analog. Bell says they were very selective in who they chose for the mission, as nearly 4,000 people applied. But only four will live in isolation for a year.

"We've specifically chosen people that we hope to succeed together very carefully screened, and really clear that they have the ability to work on teams," Bell said. "And so our objectives are really about optimizing that human health and performance."

The four inside the habitat include a Canadian biomedical scientist, a structural engineer from Virginia, a physician from Illinois, and a Romanian biochemist.

RELATED: Space Center Houston reveals plans to simulate terrains of the Moon and Mars in expansion plans

They will face planned and unplanned contingencies that would simulate living in a hostile environment like Mars.

"What if a critical piece of equipment that they're used to using, such as how they throw out trash, is no longer functioning?" Bell said. "You know, they will have to problem solve around that to be able to make it work."

They will have a Mission Control to help when they can, which will be operating 24 hours a day for the next 365 days.

For updates on this story, follow Tom Abrahams on Facebook, Twitter and Instagram.