Today's astronomers have been able to reconstruct how the universe arose by looking deep into space and finding telltale evidence of a big bang 13.5 billion years ago. The expansion and evolution of the of the universe are gradually erasing the evidence, however: a billion centuries from now, naive astronomers would see no reason to doubt that they lived in a small, empty, almost unchanging cosmos. Should we count ourselves priveledged to live in an era when the facts are still accessible to us? Or should we ponder whether unsuspected truths about the origins of space and time are already lost to us, too.

-John Rennie

Wow. Think that through for a minute.

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