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Red rocky surface of Mars with distant mountainsScience & Space

We Might Have Found Evidence of Life on Mars. Here's Why Scientists Won't Say That Yet.

In September 2025, NASA published the most compelling evidence ever found suggesting that ancient microbial life may have existed on Mars. A peer-reviewed paper in the journal Nature describes a rock sample containing "potential biosignatures," the chemical and mineral traces that microbes leave behind when they eat, excrete, and die. The discovery was called "the closest we have ever come to discovering life on Mars." And every scientist involved immediately told the public to slow down.

Alex ChenAlex Chen·8 min read

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