On Aug. 28, 2016, six NASA scientists walked outside for the first time in a full year.

They stepped out, the morning fog just beginning to clear over the barren hills, having spent the last 365 days living in a 36-foot-diameter geodesic dome nestled in the volcanic mountains of Hawaii — the closest Earthly analog for the landscape of the planet Mars.

The longest space travel simulation ever conducted in the United States was complete.

Keep Reading Show less
Heroes