What is Energy, Really? Is It Really Conserved?

Energy is one of the first things we learn in physics: it can never be created or destroyed. But what if that familiar rule has an important cosmic loophole? 🌌⚡In this episode of The DeepDive Lab, we go back to basics and ask a surprisingly difficult question: what is energy, actually? Rather than being a mysterious substance flowing through the universe, energy is best understood as a mathematical quantity connected to symmetry through Noether’s theorem.Then things get stranger. In an expanding universe, global energy conservation becomes far more complicated. Photons lose energy through cosmological redshift, while the total amount of dark energy can increase as space expands. 🌠We also explore energy vs. exergy, why useful energy quality is destroyed by irreversible processes, and whether space itself is a physical entity or simply a network of relationships. 🧠A journey into thermodynamics, general relativity, cosmology, entropy, and the foundations of physics.#Physics #Energy #Cosmology #Thermodynamics #NoethersTheorem #GeneralRelativity #TheDeepDiveLabSources discussed: Richard Feynman’s The Feynman Lectures on Physics; Emmy Noether’s 1918 symmetry theorem; literature on energy conservation in general relativity and thermodynamic exergy. Specific source details should be verified against the episode’s original research material.