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.

Summary

This quote suggests that life can only exist in certain time periods within an expanding universe, and our ability to study and understand the cosmos is limited to the habitable time interval in cosmic history. It highlights the significance of timing and emphasizes that the conditions necessary for life and astronomical exploration are not constant but dependent on specific periods in the universe's evolution.

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