The Drake Equation

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What is the Drake Equation?

  1. An equation used to estimate the number of extraterrestrial civilizations in the Milky Way galaxy
  2. An equation used to estimate the number of stars in the Milky Way galaxy
  3. An equation used to estimate the number of planets in the Milky Way galaxy
  4. An equation used to estimate the number of habitable planets in the Milky Way galaxy
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