vpowell6115 vpowell6115
  • 19-04-2022
  • Physics
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If we say that a galaxy has a lookback time of 1 billion years, we mean that _________.

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Аноним Аноним
  • 19-04-2022

If we say that a galaxy has a lookback time of 1 billion years, we mean that its light traveled through space for 1 billion years to reach us.

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