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There's a big, salty lake on Mars! Yeah, that's huge. Here's what we know.

Holy cow, there's water on Mars!

An artist's rendition of the European Space Agency's Mars Express orbiting the Red Planet. Photo by AFP/Getty Images.

This is not a drill, Earthlings. It looks like our celestial neighbor has a big 'ol lake on it.

Er, maybe I should say, a big 'ol lake in it.

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Heroes

This NASA-backed experiment raises a big point about overcoming conflict.

When your roommate eats the last Oreo in the freezer, that's an annoyance. When your roommate eats the last Oreo you'll see in months, you might have a problem.

On Sept. 17, six volunteer crew members emerged from eight months of isolation. Their quarantine, part of a NASA-backed study by the University of Hawaii, could one day help humanity plan a drama-free Mars mission.

For the last eight months, the six volunteers lived in a tiny shelter on the slopes of an active volcano, sharing their living space, meager kitchen, and solitary shower.

From a distance, their house-sized habitat looked like a golf ball sitting in the loneliest sand trap in the universe. Photo from HI-SEAS V Crew/University of Hawaii News/Flickr.

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Heroes

6 scientists spent a year in isolation for science. They told us what it was like.

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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Heroes

15 photos that prove Earth is far stranger than any science fiction.

6 spot-on things Jane Goodall said about inequality and saving the planet.

Jane Goodall is one incredible woman.

You wouldn't expect Jane Goodall, who is basically the human form of Mother Earth, to talk about Mars.

But she makes a good point.

"The photographs obtained by that little robot that's crawling around the surface of Mars makes it very clear that the planet is not a hospitable environment for human colonization," the eco-octogenarian said during a recent speech at U.S. Department of State.

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There's a big, salty lake on Mars! Yeah, that's huge. Here's what we know.

Holy cow, there's water on Mars!

This is not a drill, Earthlings. It looks like our celestial neighbor has a big 'ol lake on it.

This NASA-backed experiment raises a big point about overcoming conflict.

When your roommate eats the last Oreo in the freezer, that's an annoyance. When your roommate eats the last Oreo you'll see in months, you might have a problem.

For the last eight months, the six volunteers lived in a tiny shelter on the slopes of an active volcano, sharing their living space, meager kitchen, and solitary shower.

6 scientists spent a year in isolation for science. They told us what it was like.

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

15 photos that prove Earth is far stranger than any science fiction.

19 amazing things you don't want to miss in the night sky in 2016.

4 women at NASA are currently training to become the first to walk on Mars.

6 spot-on things Jane Goodall said about inequality and saving the planet.

Jane Goodall is one incredible woman.

You wouldn't expect Jane Goodall, who is basically the human form of Mother Earth, to talk about Mars.

A NASA rover completed a marathon on Mars — and won big for humanity.

Denver Decriminalizes Psychedelic Mushrooms

Holy cow, there's water on Mars!

This is not a drill, Earthlings. It looks like our celestial neighbor has a big 'ol lake on it.

When your roommate eats the last Oreo in the freezer, that's an annoyance. When your roommate eats the last Oreo you'll see in months, you might have a problem.

For the last eight months, the six volunteers lived in a tiny shelter on the slopes of an active volcano, sharing their living space, meager kitchen, and solitary shower.

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

Jane Goodall is one incredible woman.

You wouldn't expect Jane Goodall, who is basically the human form of Mother Earth, to talk about Mars.