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Try the following sample numbers in the Drake equation. Suppose that there are 1 billion (1,000,000,000,000)...

Try the following sample numbers in the Drake equation. Suppose that there are 1 billion (1,000,000,000,000) habitable planets in our galaxy, that 1 in 10 habitable planets has life, that 1 in 100 planets with life has at some point had an intelligent civilization, and that 1 in 500 civilizations that have ever existed is in existence now. How many civilizations would exist at present? Explain.

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Answer #1

This is just a direct application of Drake's equation

121 2× 10 10 100 500-

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