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Concepts from Modern Physics. Relativity. We experience space in 4 dimensions (but we’re now pretty sure there’s more of them). We can’t go faster than the speed of light. E=mc 2 (matter can become energy and vice versa) Time Dilation (moving clocks run slower) Non-euclidian geometry

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## Concepts from Modern Physics

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**Relativity**• We experience space in 4 dimensions (but we’re now pretty sure there’s more of them). • We can’t go faster than the speed of light. • E=mc2 (matter can become energy and vice versa) • Time Dilation (moving clocks run slower) • Non-euclidian geometry • Warped spacetime -- what is gravity anyway?**Quantum Mechanics**• Schrodinger’s cat (observing affects the experiment) • The Heisenberg Uncertainty Principle -- who says you can really know where something is? • Philosophy of physics: • Does god play dice with the universe? • Summing histories can predict the future • What happens to causality?**Cosmology**• Hubble’s law -- the further away a galaxy, the faster it appears to be moving away from us. • Where is the center of the universe? • Cosmic background radiation -- relic of the big bang? • What was the big bang? • If you can look back in time with a telescope, why can’t we just look back to the beginning? • Dark matter -- if you can’t see it, how do we know it’s there and who cares anyway? • Mass and the ultimate fate of the universe

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