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(On) Planet Nine

(On) Planet Nine

Your regular dose of astronomy medicine

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    • Discovering The Universe
      • What is science?
      • A bit of history – From Mammoths to the Copernican Revolution
      • The Scale of the Universe
      • Motion in an expanding Universe
      • The Big Bang – What is the evidence?
    • Basic Astrotools
      • Describing Motion
      • Newton’s Laws of motion
      • Conservation Laws and Kepler’s Planetary Laws
      • Light and Matter
      • The Fingerprints of Light
    • History of Astronomy
      • Henrietta Swan Leavitt
    • Debunking Myths
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    • Cosmology
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    • John A. Tomsick
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    • Alex Filippenko
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