The Panspermia Hypothesis and the Search for Extraterrestrial Intelligence

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What is the central idea behind the Panspermia Hypothesis?

  1. Life on Earth originated from extraterrestrial sources.
  2. Life on Earth is unique and did not originate from elsewhere.
  3. Life on Earth and other planets evolved independently.
  4. Life on Earth is a result of a combination of extraterrestrial and terrestrial factors.
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