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        PreK-3

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        Part of Ready Jet Go!
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        Three Rules To Be a Planet | Ready Jet Go!

        What makes a planet a planet? In this clip from Ready Jet Go!, Dr. Rafferty goes over the three rules scientists follow to determine whether something is a planet or not, and why Pluto is no longer considered a planet.

        For more Ready Jet Go! resources, visit our collection page here.

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