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Why isn’t Pluto a (major) planet anymore?

Why isn’t Pluto a (major) planet anymore?
Lesson narration:
English Spanish
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Check out this tiny egg that's even smaller than a fingernail! What kind of bird do you think laid this egg?
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It’s a hummingbird nest! Hummingbirds are the smallest birds in the world, so of course their eggs are tiny!
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The whale shark is the largest shark. But have you ever wondered: What’s the smallest shark?
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Here’s the smallest shark, a dwarf lantern shark. It lives extremely deep in the ocean. This one is full grown!
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This is one of the tiniest trees in the world, but it wasn’t supposed to grow this small! What happened to it?
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You can make just about any tree stay tiny, if you trim its roots as it grows. Doing this is called “bonsai."
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You know what tornadoes look like and how destructive they can be. But have you ever seen a tiny one?
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Tiny tornadoes are called dust devils and they’re usually harmless!
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Most dust devils only last a minute or two. People at this game just waited for it to pass then continued to play!
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Here’s the smallest lizard, a pygmy chameleon! This one is an adult. How small do you think a baby one is?
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The babies are so small, they can stand on the tip of a matchstick!
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Lesson narration:
English Spanish

Overview

In this mini-lesson, students will learn about the history of astronomy and the discovery of planets.

Exploration

5 mins

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