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View Resource Spectra

Spectra is a website illustrating how astronomers use spectra to understand what stars are made of, their structures, and their evolution. The page begins with an introduction to the electromagnetic spectrum and then goes into detail about the properties of light. Then it discusses how matter both creates and destroys radiation. It goes on to interpret absorption and emission lines. The website...

View Resource The Formation of Common-Envelope, Pre-Main-Sequence Binary Stars

This article, authored by Joel Edward Tohline of Louisiana State University, investigates if binaries can form by spontaneous fission of rapidly rotating protostars. The authors present a classical fission hypothesis, then point out the flaws in it and offer solutions.

View Resource 'Magnetars', Soft Gamma Repeaters and Very Strong Magnetic Fields

This site describes soft gamma repeaters. The author, Robert C. Duncan of the University of Texas at Austin, explains how these strange, physically-extreme stars form, and why they emit steadily pulsating X-rays with sporadic, bright outbursts. The author also tells the story of their discovery and of the theoretical efforts which helped to reveal their bizarre nature. A version of the site is...

View Resource Curious About Astronomy?

This site offers basic information about the solar system, the universe, observing the stars, space exploration and more. It contains information about astronomy topics and a list of common questions and answers. Each of the questions are labed as beginner, intermediate, or advanced.

View Resource Determining Red-Shift in a Receding Star

This activity introduces students to the concepts of the redshift of a receding star. Students will learn about the properties of light, the Doppler effect, and also about Hubble's discovery of the expansion of the universe.

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