Space-Time Expansion, Explained | Adam Riess

If the universe is expanding, why aren’t galaxies stretching apart? Cosmologist Adam Riess breaks down the physics behind cosmic expansion, the forces that resist it, and why dark energy dominates the vast spaces between.For more, check out the extended interview with Adam Riess.Learn more about NOVA and subscribe to our YouTube channel.

Episode metadata supplied by the publisher feed · Published Mar 4, 2026

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Space-Time Expansion, Explained | Adam Riess

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