We’ve Found Liquid Water Flowing On Mars, But We’re Not Allowed To Investigate It

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In 1976, NASA's Viking landers (Viking 2 shown) performed the first and only search for life on Mars to date. NASA.

Of course, we’re all excited about finding liquid salty water on the surface of Mars. But any prospects of sending a rover or even humans to study these mini "rivers" might have to be dampened (sorry), owing to issues of contamination.