LOS ANGELES- The Mars Curiosity rover uncovered signs of an ancient freshwater lake that may have supported tiny organisms over tens of millions of years.
NASA says the lake existed about 3.5 billion years ago and is near the Martian equator.
Scientists say it wasn't salty or acidic and contained nutrients making it a perfect spot for microbes.
The findings were published on Monday and presented at the American Geophysical union meeting in San Francisco.
Now the rover will look for organic compounds that are fundamental to all living things since its found what is considered a habitable environment.
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