This slide set begins by discussing the amount of dark matter on galactic and larger scales by refering to the dark matter in the Milky Way. The next set of slides reviews the motivation for and the basic physics of...

This site, created by author James B. Kaler of the University of Illinois at Urbana-Champaign, gives information relating to stars such as their brightness and distance, their mass, their birth and death, and...

Created by Bill Arnett, "The Nine Planets" is an overview of the history, mythology, and current scientific knowledge of each of the planets, moons, and some other objects in our solar system. Text, images, sounds, and...

This online textbook teaches the user about how a science project is conceived, funded, and managed. They do this by telling a story about how NASA's High Energy Astronomy Observatory (HEAO) Program executed a science...

Astronomy is a science that asks fundamental questions about the very fundament of things, the universe. How big and how far away are the planets and stars? How did they form and when? How do they move and why? Finding...