We might have killed the only life we ever found on Mars - Big Think

In one experiment, the Viking landers added water to Martian soil samples. That might have been a very bad idea.

Life on Mars: What if NASA actually finds it? - Vox

One Scientist Believes We May Have Found Life On Mars 50 Years Ago

A City on Mars: Can we settle space, should we settle space, and have we really thought this through?: Weinersmith, Kelly, Weinersmith, Zach: 9781984881724: : Books

We might have killed the only life we ever found on Mars - Big Think

Life on Mars May Have Been Its Own Worst Enemy

Alien life was found on Mars 50 years ago - but NASA accidentally KILLED it, scientist claims

NASA Has a Theory for Why Humans Might Be the Only Intelligent Life in the Universe

A scientist claims NASA found life on Mars 50 years ago but accidentally killed it

Mars: Everything you need to know about the Red Planet

Humans may have accidentally killed life found on Mars: Astrobiologist

Unexplainable podcast: 7 solar system mysteries scientists haven't solved yet - Vox