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Notes from an astronomy course at the University of Tennessee, Knoxville (USA). "In this semester of Astronomy we shall concern ourselves primarily with the Solar System. As an introduction to that, we shall consider the historical development of our modern picture of the Solar System."

Musical Solar System - based on real orbital frequencies. It's like a soothing music box made of the planets in our solar system. Awesome.

Interactive tool to help students in introductory math and science classes visualize astronomical distances.