A team of six people have completed a Mars simulation in Hawaii, where they lived in near isolation for a year.
Since 29 August 2015, the group lived in close quarters in a dome, without fresh air, fresh food or privacy.
Having survived their year in isolation, the crew members said they were confident a mission to Mars could succeed.
Mission commander Carmel Johnston said the lack of privacy over the past year had been the hardest thing.
“It is kind of like having roommates that just are always there and you can never escape them so I’m sure some people can imagine what that is like and if you can’t then just imagine never being able to get away from anybody,” she said.
While doing the research, the six had to live with limited resources, wear a space-suit when outside the dome, and work to avoid personal conflicts.
Experts estimate that a human mission to the Red Planet could take between one and three years.