As the search for life on Mars continues – with promising potential biosignatures recently identified by NASA at the Bright Angel formation – there are a few scientists out there who think we may have found life on the Red Planet already. According to four authors of a recent letter to the journal Science, NASA's Viking lander may have detected signs of extant life on the planet in 1976, and we have incorrectly interpreted the probe's results. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

Long before the first Mars rover, Sojourner , set its robotic wheels on Mars in 1997, two landers touched down. NASA's Viking Project – the first spacecraft to land on Mars, capturing the first-ever images from the Martian surface – saw the la

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