Is energy always conserved?

The video explores the concept of the expanding universe and its implications, particularly focusing on the phenomenon of redshift. It explains how light from distant galaxies is stretched, leading to a decrease in energy, and challenges the traditional understanding of energy conservation. The video introduces Noether's theorem, which links conservation laws to symmetries in the universe, and discusses how changes in spacetime affect these laws. It concludes by highlighting the limitations of our intuitive understanding of physics, using a folktale to illustrate the idea that our knowledge is often limited to our immediate experiences.

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