Nisson presented preliminary findings from the ongoing research project this week at a meeting of the American Geophysical Union in San Francisco. Supported by funding from NASA and the National Science Foundation, the researchers collected samples in 2018 and 2019 by descending into a gold and uranium
-- Two miles under a grassy plain in South Africa, pockets of water lie trapped in the rock. Scientists think the pockets might have been isolated from the surrounding environment for 2 billion years. These liquid time capsules are hot, salty, and devoid of nutrients from the surface, and they may be chemically similar to water deposits on Mars."There is a potential that [the pockets] were isolated over that long time scale.
When they examined the material under a scanning electron microscope, they saw rodlike shapes that appeared to be bacteria or similar-looking microbes called archaea. One of the cells was pinched in the middle, apparently in the process of dividing. But even without DNA, the researchers can still get clues about whether life might be able to survive there. Water in the pockets is about seven times saltier than seawater and reaches temperatures of up to 129 degrees Fahrenheit, right at the edge of what life is thought to tolerate. But Nisson and her colleagues have found an abundance of small organic acids that could supply the carbon required to build and maintain cellular structures.
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