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

User Lazyexpert
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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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User Rudi Urbanek
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