Cosmos
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Episode Synopsis

Time seems natural and absolute: the flow of moments one following another from the unknown past to the knife's edge present to the unknowable future. But this is not so. Einstein shocked the world by showing that time was "relative." What's the latest about time?

Episode Segments

1. Gregory Benford
2. Kip S. Thorne
3. Nima Arkani-Hamed
4. Lee Smolin

What's Real About Time?

Discussion