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Scientist Hints at Silicon-Based Life Underground Dr. Tom Gold, emeritus professor of astronomy at Cornell University, says there's a good chance silicon-based life lives in solid rock deep under the earth. Start Date: 12/05/98 A leading U.S. scientist will soon publish a book in which he suggests that silicon-based life may exist on planet Earth, deep underground. All currently acknowledged forms of life are carbon-based, and it is widely assumed that life on other planets, if it exists, will also depend upon carbon chemistry. However, silicon is very similar to carbon in ways that could theoretically lead to entirely separate and extremely alien forms of life. Silicon is one of the most common elements on Earth and throughout the galaxy. The idea of silicon-based life has been explored in science fiction, but not taken very seriously among scientists until now. According to a November 22, 1998 story in the Sunday Times (UK), Dr. Tom Gold, emeritus professor of astronomy at Cornell University, believes efforts should be made to discover if silicon-based forms of life exist on Earth. Gold previously predicted that large quantities of conventional (carbon-based) bacteria would be found living in solid rock deep underground. At first, that suggestion was not taken seriously by most of his colleagues, but in recent years Gold's prediction has turned out to be true. Now, regarding his even more exotic new idea, Gold says, "So long as nobody suspects there could be silicon-based life, we may just not be clever enough to identify it." In a book titled "The Deep Hot Biosphere" to be published in January, Gold argues that silicon-based life forms deep underground could be adapted to an environment far hotter and more pressurized than carbon-based life forms can stand. Such an alternate biosphere, if it exists, could provide a satisfactory explanation for the formation of deeply buried oil, gas and mineral deposits, Gold says. David Noever, a scientist at NASA's new Astrobiology Institute, told the Times that he and some of his colleagues already take the idea of silicon-based extraterrestrial life seriously. "It's almost naive to assume all life must be carbon-based. I could possibly make good cases for life based on both silicon and phosphorus," Noever said.
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