Subsurface biofilms could hold clues to alien life, astrobiologists say
By Lauren Robinson
Are we alone?
If you’re wandering around the chambers of the Deep Mine Microbial Observatory, what was once a gold mine in South Dakota, it might feel as though you are — until, perhaps, you take a fluid sample from a borehole in the tunnel wall, run it under a microscope and observe one of the droplets teeming with microbial life.
Caitlin Casar, a third-year Ph.D. student at Northwestern University, says scientists can’t yet answer the big question: Are we alone in the universe?
“I hope that there is life on another planet, but whether or not it’s probable, I don’t think anybody can really say,” she said.
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