NASA Reveals Traces of Water Found on Mars

The findings raise the possibility that there could be life or even microbes living inside the Red Planet.
2:05 | 09/29/15

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Transcript for NASA Reveals Traces of Water Found on Mars
Every time you take Advi Yo re tu'thinakdie G cimedoornerecos D moenst jofo ininr .pa re tn E hamedici in Ale or Tylol. The Medine in Adl is T number E meecornndomjo iopainfo.t Reliefoesn't G Any tter T perspective. Here's ABC's David Kerley. Reporter: It sounds like something sci-fi. But nasa's Mars orbiter has seen something only imagined. Liquid water has been found on Mars. Reporter: The essential ingredient of life on the red planet. Look closely. During the summer months, little riff ouelle rivelets develop. That scientists say is salty, even briny water which disappears in winter. Billions of years ago Mars had an ocean. Was there life then? With this discovery is there life now? The discovery really is most exciting because it suggests that it would be possible for there to be life today on Mars. Reporter: It could also change a manned mission to Mars. Water on that planet means that astronauts, if they travel to Mars, may not have to carry water and other resources. Is this really a breakthrough for humans to visit Mars? We could use that water, use that water to drink, of course. To break up into its parts. Hydrogen, oxygen. Breathe the oxygen. Hydrogen/oxygen is a great rocket fuel. Right now only rovers like curiosity are on the surface of Mars. With the discovery of water, a human visit becomes a bit more of a possibility. People down here on the original blue planet, having some fun online with the announcement. Sharing this very literal take on the discovery. And this updated snapshot of the Mars rover. In your face, Neil Armstrong. Reporter: Some joking on Twitter that it's all an elaborate promo for a Matt Damon movie about a mission to Mars. I've done the math. Checks out. Reporter: For "Nightline," I'm David Kerley in Washington, D.C. I wouldn't put it past that crafty Matt Damon. Thank you, David Kerley, for that report.

This transcript has been automatically generated and may not be 100% accurate.

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