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

If we say that a galaxy has a lookback time of 1 billion years, we mean that _________.
asked 27.4k views
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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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User Krzysztof Antosik
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5 votes

Answer:

its light traveled through space for 1 billion years to reach us

Step-by-step explanation:

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User Danie
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