Harvard University
Quasars and Active Galaxies
This site provides information about quasars and active galaxies. Includes a glossary of important terms.
PBS
Pbs Learning Media: Spin a Spiral Galaxy
This interactive activity from NOVA Online lets you spin a spiral galaxy, including our own Milky Way. It demonstrates that what you can learn from visible light observations of a galaxy is largely determined by the angle from which you...
NASA
Nasa: Imagine the Universe: Black Holes
Learn what black holes are and the myths that surround them.