Outrunning the Planets: Retrograde Motion

When the world was at the center of the universe, the planets did a strange dance.
At times, it seemed they moved in reverse at times, doing a weird backward loop.
But this wasn't just a quirk.
It wasn't a wrinkle that needed to be ironed out with a theory like "epicycles."
No, this was a loose thread.
And when Kepler and Copernicus pulled it, our view of the universe unraveled.

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