 The crew of a NASA mission to Mars has returned to Earth, even though they never really left. The four volunteer crew members spent the last year inside NASA's first simulated Mars environment, located much closer to home at Johnson Space Center in Houston. The group lived and worked inside an apartment-sized space that mimicked a mission to the Red Planet, even simulating challenges like a potential communication delay. However, no little green men were encountered during their mission. Oh, is that right? They couldn't come up with that?