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There are only certain intervals of time when life of any sort is possible in an expanding universe and we can practise astronomy only during that habitable time interval in cosmic history.
John D. Barrow The Book of Universes: Exploring the Limits of the Cosmos
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There are only certain intervals of time when life of any sort is possible in an expanding universe and we can practise astronomy only during that habitable time interval in cosmic history.
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John D. Barrow

The Book of Universes: Exploring the Limits of the Cosmos

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