When the experiment successful, then people might get up to try to live on the space, which is very exciting, so soon people would have to live on the space!
When the experiment was successful, then people might have to try to live on the space, which is very exciting, so before long people would have to live on the space really.
When the experiment is successful, then people may go to live on the space which the exciting much so soon would be up to the people living on the space.