Mars mission crew member answers YOUR questions
Could humans live on Mars one day?
It's a question that has captured the attention of many space experts, and one special Nasa team has been helping to work out how it could be done.
The crew spent 378 days in a specially designed 3D printed habitat where they carried out experiments, worked on robotics, and also took part in simulated Mars walks.
They left the habitat in July following the year-long mission.
Crew member Dr Nathan Jones has been answering some of your questions about the mission.
Footage/photo credit: NASA/CHAPEA