University of Colorado
University of Colorado: Physics 2000: Electromagnetic Waves
Using a student-teacher dialogue format, this page discusses the nature of light as an electromagnetic wave and the electromagnetic spectrum.
NASA
Nasa: Imagine the Universe: Supernovae Remnants
A brief description of supernova remnants with many embedded links to help define terms used in the description. The specific topics are age and the importance of remnants to us and the types. Definitions of key words are provided.
University of Wisconsin
The Why Files: 3 2 1 Contact, Don't Touch That Dial
A discussion of reflecting telescopes and their use in radio astronomy. The types of information gained from and the research emphasis fueled by such telescopes is described. Site uses Hollywood references and a humorous style.
University of Wisconsin
The Why Files: Infra Red Eye Special
A description of the ways in which infra-red is used in astronomy, including an extended example describing how infra-red was used to learn about Pluto's moon, Charon. There are also links to other sites of astronomical interest.