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Four volunteers who spent more than a year living in a 1,700-square-foot space created by NASA to simulate the environment on Mars have 

The members of the Crew Health and Performance Exploration Analog mission — or CHAPEA — walked through the door of their habitat at NASA’s Johnson Space Center in Houston on Saturday to a round of applause.

“Hello. It’s actually just so wonderful to be able to say hello to you all,” CHAPEA commander Kelly Haston 

Haston and the other three crew members — Anca Selariu, Ross Brockwell and Nathan Jones — entered the 3D-printed Mars replica on June 25, 2023, as part of a NASA experiment to observe how humans would fare living on the Red Planet.

The volunteers grew their own vegetables, maintained equipment, participated in so-called Marswalks and faced stressors that actual space travelers to Mars could experience, including 22-minute communication delays with Earth.

The 378-day endeavor was the first of three NASA missions the space agency has planned to test how humans would respond to the conditions and challenges of living on Mars, where it says it could 

 as soon as the 2030s. NASA’s second CHAPEA mission is 

 the spring of 2025, and the third is slated to begin in 2026.

After emerging from isolation on Saturday, CHAPEA science officer Anca Selariu reflected on why she and others chose to dedicate themselves to this particular effort.

“I’ve been asked many times: Why the obsession with Mars? Why go to Mars?” Selariu said. "Because it’s possible. Because space can unite and bring out the best in us. Because it’s one defining step that Earthlings will take to light the way into the next centuries.”

NASA has conducted other isolation experiments before, including 

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The four crew members entered the 3D-printed Mars replica on June 25, 2023, as part of a NASA experiment to observe how humans would fare living on the Red Planet.

Volunteers who lived in a NASA-created Mars replica for over a year have emerged

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