Some perchlorates are able to keep water from freezing even at temperatures as cold as -94 degrees Fahrenheit. The perchlorates on Mars are forming the streaks, called recurring slope lineae (RSL), on the Martian slopes during the planet's warm season, when temperatures climb above -10 degrees Fahrenheit. The streaks then disappear during the cold season.
NASA Scientists Have Found Evidence of 'Flowing Liquid Water' on Mars
Imaging instruments aboard NASA's Mars Reconnaissance Orbiter identified evidence of "hydrated minerals" called perchlorates that have formed streaks on slopes on Mars' surface, the agency said.
"The most exciting thing about the announcement today is that it would be possible to have life on Mars," said NASA's John Grunsfeld at a press conference Monday.
"Something is hydrating these salts, and it appears to be these streaks that come and go with the seasons," Lujendra Ojha, one of the researchers on the project, said in a statement. "This means the water on Mars is briny, rather than pure. It makes sense, because salts lower the freezing point of water. Even if RSL are slightly underground, where it's even colder than the surface temperature, the salts would keep the water in a liquid form and allow it to creep down Martian slopes."
The team is publishing its findings in the journal Nature Geoscience.
"Our results may point to more habitable conditions on Mars that previously thought," said Mary Beth Wilhelm, one of the paper's co-authors. She added that scientists will need to learn more about the briny water.
Wilhelm noted that in addition to supporting Martian life, water may be an important resource for human exploration and activity on the planet, by making it easier and less expensive to travel to the Red Planet.
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