This web site contains four animated tutorials that demonstrate different astronomy concepts. These include: Lunar Phases shows how the motion of the moon relative to the Earth and Sun change the appearance of the moon;...
This collection of lecture notes discusses the fundamentals of astronomy. The lecture notes review the topics of celestial mechanics, light, matter, planets, telescopes, the sun, stellar astronomy, stellar evolution,...
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...
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