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.

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NASA is making plans to send a probe to Europa — one of Jupiter's more than 60 moons — and you wanna know why we should all be excited about this?

Image from NASA/JPL-Caltech.

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Why NASA is celebrating this photo of a seemingly ordinary zinnia.

Astronauts Scott Kelly and Kjell Lindgren accomplished something that had never been done before in 55 years of space travel.

The vacuum of space.

Photo by ogunhe/Deviant Art.

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