Evolution Message Board - Msg: 26954547

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Politics : Evolution

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To: Solon who wrote (9718)	11/11/2010 10:47:24 AM
From: longnshort	Read Replies (2) of 69300

In 1961, University of California, Santa Cruz astronomer and astrophysicist Dr. Frank Drake devised the Drake equation. This controversial equation multiplied estimates of the following terms together: The rate of formation of suitable stars. The fraction of those stars which are orbited by planets. The number of Earth-like worlds per planetary system. The fraction of planets where intelligent life develops. The fraction of possible communicative planets. The "lifetime" of possible communicative civilizations. Drake used the equation to estimate that there are approximately 10,000 planets in the Milky Way galaxy containing intelligent life with the possible capability of communicating with Earth.[34] Based on observations from the Hubble Space Telescope, there are at least 125 billion galaxies in the Universe. It is estimated that at least ten percent of all sun-like stars have a system of planets,[35] i.e. there are 6.25×1018 stars with planets orbiting them in the universe. Even if we assume that only one out of a billion of these stars have planets supporting life, there would be some 6.25×109 (billion) life-supporting planetary systems in the Universe.

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