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  - Exoplanets
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    - Direct Imaging 4
    - Microlensing 5
    - Planet Types 5
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  - Celestial Mechanics & Orbits
    - Orbital Motion 5
    - Kepler Laws 5
    - Newton Laws 5
    - Orbital Gravity 5
    - Eclipses 6
    - Precession 5
    - Retrograde Motion 5
    - Perturbations 5
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Cosmic Clockwork: Orbital Period Calculation Quiz

The math behind the movement. By measuring how long a planet takes to circle its star, we can figure out exactly how far away it is. This orbital period calculation quiz tests the laws of physics that govern planetary...