NASA | Einstein's Cosmic Speed Limit

The video explores the role of light in understanding the universe, focusing on the Fermi Gamma Ray Space Telescope's observations of two photons traveling across 7 billion light years. These observations challenge existing theories by showing no delay in photon arrival times, suggesting space-time is smooth as per Einstein's predictions. The video discusses the difficulty in unifying relativity and quantum mechanics, and how Fermi's findings eliminate some theories, bringing us closer to a unified theory of everything.

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