Space Case
Description Overview of modern scientific cosmology, including discussion of stars, the Milky Way galaxy, black holes, dark matter, the big bang, and evidence for our current understanding of the universe.
Physics 20b: Introduction to Cosmology - Spring 2010 - Download free content from UC Irvine on iTunes - Waterfox
Last November astronomer David Nesvorny of the Southwest Research Institute in Colorado added a new character to the tale. Nesvorny, who runs computer simulations to study how the solar system evolved over time, kept encountering the same problem: The four giant gas planets, whose orbits are comfortably far apart from each other today, kept violently jostling with each other in his models of the early solar system. Jupiter would end up tugging on Uranus or Neptune and casting one of them out into interstellar space.
The Solar System's Lost Planet | Solar System | DISCOVER Magazine - Waterfox