CAS AS 107 Study Guide - Midterm Guide: Project Ozma, Polar Orbit, Crop Circle

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N = r* fp ne fl fi fc l. N = # of advanced communicating civilizations in the milky way. Liquid water oceans for billions of years without freezing or evaporating fc = fraction of intelligent species that develop interstellar communication. L = length of time (years) that the civilizations tries to communicate. Gas cloud rotation faster flattening continues fragments form. Composition of matter is the same everywhere in the universe. The laws of nature (physics, chemistry, biology, etc. ) are the same everywhere in the universe. Nothing special about our sun, earth & solar system. Nothing special about humankind and its technology. The rest of the universe is probably similar to our neighborhood. Events in the history of earth are likely to occur elsewhere. This principle states that there"s nothing special about the solar system or earth. Used (cid:884)(cid:883) cm wavelength emission from hydrogen (cid:523)named after wizard of oz(cid:524) .

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