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Earth ↔ Carl Sagan

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cross_type 2.32 — strongly supporting 2 facts

Carl Sagan frequently referenced Earth as a reference point for biological principles [1], [2] and as a destination for potential extraterrestrial visitors [3], while also using the planet as a spatial reference for the Arecibo Message transmission [4].

Facts (2)

Sources
Hypothetical types of biochemistry - Wikipedia en.wikipedia.org Wikipedia 1 fact
claimCarl Sagan argued that it is difficult to determine if biological principles applicable to life on Earth apply to all life throughout the universe.
UFOs and the U.S. government: The push towards greater ... - WBUR wbur.org WBUR 1 fact
claimCarl Sagan argued that statistically, aliens likely visit Earth every few hundred thousand years, treating the planet as a way station rather than a place of specific interest.