"Life is not a miracle," says Nobel Prizewinning Chemist Harold C. Urey. "It is a natural phenomenon, and can be expected to appear whenever there is a planet whose conditions duplicate those of the earth."
Such planets cannot be rare, said Urey last week in a lecture at the New York Academy of Medicine. According to a star census taken by Astronomer Gerald P. Kuiper of the University of Chicago, there are 100 billion stars in the Milky Way galaxy, and one star in each thousand is believed to have planets circling around it. So there must be 100 million "solar systems"...
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