Found on Mars: Cool, Clear Water?

Dark, narrow streaks going downhill at four locations on Mars are evidence of water flowing on the planet. Called "recurring slope lineae," the streaks are approximately the length of a football field, according to NASA's Jet Propulsion Laboratory. They are believed to have been formed by the seasonal flow of water. Lujendra Ojha of the Georgia Institute of Technology noticed these lineae as an undergraduate student at the University of Arizona in 2010. His team's report on the research was published Monday in Nature Geoscience.

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