Video: The Unbelievable Genius of Kepler 400 Years ago: Kepler’s Third Law of Motion – Law of Periods (Astronomy)
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[This man only had an ink pen and paper to work on. I didn't even know about his Third Law. With it you can weigh the Moons of planets. It's unbelievable what he came up with. Jan]
Here’s the video: https://www.youtube.com/watch?v=KbXVpdlmYZo
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