Crash Course
Crash Course Kids 22.2: Orbits Are Odd
Why doesn't the moon just crash into the Earth? And why doesn't the Earth crash into the Sun? What are orbits exactly and why do they happen? Well, it has to do with gravity and velocity. In this episode of Crash Course Kids, Sabrina...
Sophia Learning
Sophia: Neils Bohr: Lesson 3
This lesson will introduce the Bohr model of the atom as one where electrons exist in various, distinct energy levels/shells. It is 3 of 3 in the series titled "Neils Bohr."
University of Oregon
Electronic Universe: Kepler's Laws of Planetary Motion
From the The Electronic Universe Project web site. This page states and explains Kepler's three laws of planetary motion. Includes some downloadable movie clips and associated sound files. Discusses Ptolemy's attempt to explain...
Mocomi & Anibrain Digital Technologies
Mocomi: Discovery of Planetary Motion
Discusses the work of Johannes Kepler and his Law of Ellipses.