Mars Wasn’t Always Dead: Did Life Begin Before Its Heart Stopped?

Mars is a cold, barren desert today—but billions of years ago, it may have been a very different world.

Ancient Mars appears to have once possessed liquid water, rivers, lakes, a thicker atmosphere, volcanic activity, and a molten iron core capable of generating a planetary magnetic field.

That magnetic field may have helped protect the atmosphere from the solar wind.

But eventually, Mars began to lose its internal dynamo. Its magnetic field weakened and disappeared, its atmosphere thinned, and its surface water was lost, frozen, or trapped beneath the surface.

Today, Mars remains geologically active enough to experience marsquakes, while evidence of residual heat deep beneath the planet raises an intriguing possibility: could liquid water still exist underground?

If Mars once had the necessary ingredients for life—and had them for hundreds of millions of years—the most fascinating question may be whether life had enough time to begin before the planet lost its protective magnetic field.

Could evidence of ancient Martian life still be waiting beneath the surface?

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