FOR KIDS: Possible new saltwater stains on Mars

Dark streaks that grow in spring, fade in winter may point to saltwater on the Red PlanetWeb edition : Wednesday, August 31st, 2011 This image of a slope inside a Martian crater is actually a combination of several pictures taken by an instrument onboard the Mars Reconnaissance Orbiter. Scientists suspect the long, thin dark streaks are signs of saltwater that flows and then evaporates.HiRISE, MRO, LPL (U. Arizona), NASA

Here on Earth, it’s easy to find saltwater: Just head to the nearest sea. Oceans cover most of Earth’s surface, which means if you were to transport yourself to a random spot on our planet, you would probably end up all wet.

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