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Exa is not a measurement unit. It is a prefix which means a quintillion or 10^18. So, for example,

  • an exametre is a quintillion metres or approx 106 light years;
  • the mass of the moon is approx 73 exatons
  • an exasecond is approx 32 billion years, or more than twice the age of the universe.
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Q: What can you measure with exa?
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