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While today’s discovery is huge, it is small compared to the rivers, lakes and vast oceans that are believed to have flowed on Mars billions of years ago. The findings, however, are a boon for a future human mission to Mars since the existence of water could help lighten astronauts' load.

“I think all of the scientific discoveries we’re making on the surface of Mars…these observations are giving us a much better view that Mars has resources that are useful to future travels,\" John Grunsfeld, NASA associate administrator, said at the news conference. \"I think all of the scientific discoveries we’re making on the surface of Mars, these observations are giving us a much better view that Mars has resources that are useful to future travels.\"

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