'This means we can’t study or even notice them because they are outside of our comprehension.'
If Sharman is right and invisible aliens do live among us, Rolfe believes they most likely live in a microscopic "shadow biosphere."
"By that, I don’t mean a ghost realm, but undiscovered creatures probably with a different biochemistry," she wrote. "This means we can’t study or even notice them because they are outside of our comprehension."Rolfe goes on to suggest that the invisible aliens could have a silicon-based biochemistry, as opposed to the carbon-based one we're familiar with.
Several research teams are already studying such alternative biochemistries, according to Rolfe, includingthat managed to coax living cells to bond with silicon— and if we can bring silicon to life on Earth, there's a chance silicon-based lifeforms could have evolved naturally elsewhere in the universe and hitched a ride here aboard a meteorite.
"[W]e do have evidence for life-forming, carbon-based molecules having arrived on Earth on meteorites," she wrote, "so the evidence certainly doesn’t rule out the same possibility for more unfamiliar life forms."
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