Suppose that there are 10 billion (10,000,000,000,000) habitable planets in our galaxy, that 1 in 5 habitable planets has life, that 1 in 1000 planets with life has at some point had an intelligent civilization, and that 1 in 1000 civilizations that have ever existed is in existence now. How many civilizations would exist at present?
A) 200,000
B) 2,000,000
C) 20,000
D) 20,000,000

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The Answer of Suppose that there are 10 billion (10,000,000,000,000) habitable planets in our galaxy, that 1 in 5 habitable planets has life, that 1 in 1000 planets with life has at some point had an intelligent civilization, and that 1 in 1000 civilizations that have ever existed is in existence now. How many civilizations would exist at present?
A) 200,000
B) 2,000,000
C) 20,000
D) 20,000,000

Suppose That There Are 10 Billion (10,000,000,000,000) Habitable Planets in Our