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speed of light
used in Turtles All the Way Down

only 1 use
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Definition
about 186,000 miles per second (or 300,000,000 meters per second) in a vacuum
  • "It means if we were traveling at the speed of light, it would take us forty-five minutes to get from Earth to Jupiter, so the Jupiter we're seeing right now is actually Jupiter forty-five minutes ago.
    p. 103.0

There are no more uses of "speed of light" in Turtles All the Way Down.

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