Cool gravity visualization  DEC 05 2013

Using a large piece of spandex (representing spacetime) and some balls and marbles (representing masses), a high school science teacher explains how gravity works.

The bits about how the planets all orbit in the same direction and the demo of the Earth/Moon orbit are really neat. And you can stop watching around the 7-minute mark...the demos end around then.

Update: Here's another video of a similar system with some slightly different demos.

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