Poor Pluto. It was totally unknown and then it was a planet and now it's not a planet anymore.

This change in the status of planets isn't the first time such a thing has happened.

Since the dawn of history, the number of things we call a planet has gone up and down.

Find out why Pluto got demoted from a planet and learn about our human history with planets on this episode of

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Since humans first looked up at the night sky and saw twinkling lights, they noticed that some of the lights were different.

They moved. They moved in regular patterns, and they could track their movement across the sky over time.

These moving lights were eventually known as planets.

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