Planetary system videos (i.e., Planetary system videos):

1. Asteroid impact videos:

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2. Exoplanet videos (i.e., Exoplanet videos):
   1. Exoplanets: Tatooine (Kepler 16b) | 2:05: The double-sun exoplanet system Kepler 16b explained by NASA maybe (see end credits). Too long for the classroom.
   2. First "Goldilocks" Exoplanet Discovered by NASA-funded Researchers | 2:25: This exoplanet Gliese 581 g was discovered by orbital modeling and that is subject to uncertainties---it may not exist and there is no closure circa i.e., 2019 Jul05. Too long for classroom.
   3. Direct Image Of Extrasolar Planet | 10:00: Too long for the classroom.
   4. Mars-mass exomoons orbiting giant planet | 0:30: Based on Heller & Pudritz 2015 (revised 2018). Coauthor Ralph Pudritz is one of my mentors long ago at McMaster University. Actually, the Mars-mass exomoon seems to be unrotating relative to the observable universe or to the parent star. Actually, the exomoon is likely to be tidally locked to its parent gas giant planet. Whether or NOT it is tidally locked depends on 3 main factors: the tidal force of the gas giant on the exomoon, the rotational inertia of the exomoon, and the age of the planetary system since tidal locking takes time to be established. Good for the classroom.
   5. Habitable exomoon | 1:08: Imaginative views from habitable exomoons. Such an exomoon would have a spectacular sky. It is possible that many or even most habitable worlds in the observable universe are actually habitable exomoons. Good for the classroom.
3. Nebular hypothesis videos (i.e., Nebular hypothesis videos):
   1. Wikipedia: Solar system Formation: Timeline of Solar System evolution: NOT a video, but is a useful adjunct to the videos.
   2. Birth of our Solar System | 2:15: Seems OK. Too long for classroom.
   3. IMMANUEL KANT : CRITIQUE OF PURE REASON | 9:32: NOT on topic, but on the nearly first proposer of the nebular hypothesis, Immanuel Kant (1724--1804) (see Wikipedia: Nebular hypothesis: History) NOT for the classroom.
4. See Planetary system formation videos below (local link / general link: planetary_system_formation_videos.html):

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5. Radioactive decay videos (i.e., Radioactive decay videos):
   1. Chemistry: Radioactive Decay and Half-Life (Carbon Dating) | 5:33: Too long for the classroom.
   2. Radiometric Dating | 7:09: Too long for the classroom.
   3. Half Life | 8:38: Too long for the classroom.
6. Local file: local link: planetary_system_videos.html.
   File: Planetary systems file: planetary_system_videos.html.