Here is a link to the Nasa website to shoot the cannon:
http://spaceplace.nasa.gov/how-orbits...

What if the sun suddenly disappeared? Or, even more of a realistic physics question, what if the sun suddenly became a black hole? Would the earth fly into outer space? Would it get sucked in? I teach you some of the basics about gravity and orbiting. I show you why things orbit, and what it means.

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