Gravitation: The Four Fundamental Forces of Physics #3

Hank continues our series on the four fundamental forces of physics with a description of gravitation - the interaction by which physical bodies attract with a force proportional to that of their masses, and which is responsible for keeping planets in orbit, among other things. Like SciShow on Facebook: Follow SciShow on Twitter: References for this episode can be found in the Google document here: scishow, science, physics, gravitation, universal gravitation, 4ff, fundamental forces, interaction, gravity, law of gravity, universe, galaxy, star, attraction, mercury, isaac newton, albert einstein, space, time, spacetime, light, general theory of relativity, black hole, force carrier, graviton, hank green

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