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Home : Physical Science : Astronomy
CATEGORIES:
  1. Fundamentals (139)
Basics principles, laws of physics, working models
  2. The Night Sky (66)
Constellations, star charts, and celestial coordinate systems
  3. Telescopes and Spacecrafts (69)
How to use and purchase telescopes, optics, mounts
  4. The Solar System (247)
Our Sun, the nine planets, asteroids, and comets
  5. Stars (97)
Properties, formation, and evolution of star
  6. Galaxies (102)
The Milky Way, Active Galaxies, Quasars, Cosmology
 
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