NASA/JPL-Caltech/MSSS

A long time ago, life left microscopic signatures on Mars — or did it? That's the question NASA scientists have worked for years to answer. On Wednesday, NASA researchers said the answer might be in a rock sample that "contains potential biosignatures."

The finding, published Wednesday in the journal Nature , puts the agency one step closer to answering one of humanity's most profound questions about life in the universe, said Nicky Fox, associate administrator of NASA's science mission directorate.

"This finding by our incredible Perseverance rover is the closest we've actually come to discovering ancient life on Mars. And if you can't tell, we're really excited about that," Fox said during a news conference at NASA's headquarters in Washington.

The excitin

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