NASA
Nasa: Imagine the Universe: Welcome to the World of X Ray Astronomy
Site recounts how X-rays were discovered as well as who discovered them. Offers graphics, links to facts on this topic, a quiz, and teacher resources.
NASA
Nasa: Imagine the Universe: Pulsars
Resource explores what a pulsar is, as well as what is currently known about this phenomenon. Content includes a focus on x-ray observations of pulsars, and gamma-ray pulsars.
PBS
Pbs Learning Media: The Electromagnetic Spectrum: Frontline
This video segment adapted from FRONTLINE introduces the electromagnetic spectrum and explains how the various types of electromagnetic waves are distinguished by the amount of energy each wave carries.
NASA
Nasa: Imagine the Universe: "Twinkle, Twinkle (Really Fast!), Little Star"
"The Rossi X-ray Timing Explorer has discovered neutron stars that emit streams of X-rays pulsing over 1,000 times a second." Visit this site to read the rest of this article. Site offers additional resources as well as a Teacher's Corner.