If we say that a galaxy has a lookback time of 1 billion years, we mean that _________.

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asked Jul 3, 2023 206k views

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Rudi Urbanek · Answer 1 · 2023-07-06T22:47:17+0000

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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If we say that a galaxy has a lookback time of 1 billion years, we mean that _________.

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