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Universal Speed in an Elephant Sanctuary

Pale Blue Pod

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The Rotation Curves of Galaxies

The sun is like four and a half billion years, which means it's done about 18 orbits around the center of the galaxy. Turin: We're not too affected by the dark matter halo or the massive stars outside of our orbit. But it does affect us a little bit because we move with what we call epicyclic motion. Have you heard this word, epicycle? Ooh, spooky.

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