a1c15 - Astronomy 1 Last class Detectors space astronomy...

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Astronomy 1 Last class: Detectors, space astronomy. Today: Relativity. Albert Einstein quote of the day: “I was sitting in the patent office in Bern when all of a sudden a thought occurred to me: if a person falls freely, he won’t feel his own weight. I was startled. This simple thought made a deep impression on me. It impelled me toward a theory of gravitation.” — In Kyoto lecture, December 14, 1922.
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Special Relativity Absolute reference frame: aether.
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Special Relativity Absolute reference frame: aether. light waves move at constant speed relative to the aether.
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Special Relativity Absolute reference frame: aether. light waves move at constant speed relative to the aether. Michelson-Morely experiment (1887):
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Special Relativity Absolute reference frame: aether. light waves move at constant speed relative to the aether. Michelson-Morely experiment (1887): measure c in direction of Earth’s motion and opposite.
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Special Relativity Absolute reference frame: aether. light waves move at constant speed relative to the aether. Michelson-Morely experiment (1887): measure c in direction of Earth’s motion and opposite. speed of light should be different, when moving in different directions.
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Special Relativity Absolute reference frame: aether. light waves move at constant speed relative to the aether. Michelson-Morely experiment (1887): measure c in direction of Earth’s motion and opposite. speed of light should be different, when moving in different directions. result: speed of light the same in all directions!
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Special Relativity Basis for Einstein’s theory of special relativity:
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Special Relativity Basis for Einstein’s theory of special relativity: Laws of Physics are the same in all reference frames.
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Special Relativity Basis for Einstein’s theory of special relativity: Laws of Physics are the same in all reference frames. Speed of light is the same for everyone.
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Special Relativity Thought experiment — Dirty Harry and Captain Kirk:
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Special Relativity Thought experiment — Dirty Harry and Captain Kirk: Dirty Harry in a car travelling at 100 mi/h.
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Special Relativity Thought experiment — Dirty Harry and Captain Kirk: Dirty Harry in a car travelling at 100 mi/h. fires a bullet at 700 mi/h.
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Special Relativity Thought experiment — Dirty Harry and Captain Kirk: Dirty Harry in a car travelling at 100 mi/h. fires a bullet at 700 mi/h. hits stationary target at 800 mi/h.
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Special Relativity Thought experiment — Dirty Harry and Captain Kirk: Dirty Harry in a car travelling at 100 mi/h. fires a bullet at 700 mi/h. hits stationary target at 800 mi/h. High velocities:
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Special Relativity Thought experiment — Dirty Harry and Captain Kirk: Dirty Harry in a car travelling at 100 mi/h.
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