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A handout image made available by NASA on September 27, 2015, shows dark, narrow, 100 meter-long streaks called recurring slope lineae flowing downhill on Mars, inferred to have been formed by contemporary flowing water. Recently, planetary scientists detected hydrated salts on these slopes at Hale crater, corroborating their original hypothesis that the streaks are indeed formed by liquid water. The blue color seen upslope of the dark streaks are thought not to be related to their formation, but instead are from the presence of the mineral pyroxene. AFP PHOTO /NASA/JPL/UNIVERSITY OF ARIZONA 

==RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /NASA/JPL/UNIVERSITY OF ARIZONA" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENT - AFP IS NOT RESPONSIBLE FOR ANY DIGITAL ALTERATIONS TO THE PICTURE'S EDITORIAL CONTENT, DATE AND LOCATION ==-/AFP/Getty Images
A handout image made available by NASA on September 27, 2015, shows dark, narrow, 100 meter-long streaks called recurring slope lineae flowing downhill on Mars, inferred to have been formed by contemporary flowing water. Recently, planetary scientists detected hydrated salts on these slopes at Hale crater, corroborating their original hypothesis that the streaks are indeed formed by liquid water. The blue color seen upslope of the dark streaks are thought not to be related to their formation, but instead are from the presence of the mineral pyroxene. AFP PHOTO /NASA/JPL/UNIVERSITY OF ARIZONA 

==RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /NASA/JPL/UNIVERSITY OF ARIZONA" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENT - AFP IS NOT RESPONSIBLE FOR ANY DIGITAL ALTERATIONS TO THE PICTURE'S EDITORIAL CONTENT, DATE AND LOCATION ==-/AFP/Getty Images

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