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Chapter 5 - The Earth-Moon System

earth_science

Unit C - Observing the Sky

Chapter 5 - The Earth-Moon System

Read interviews with astronomers, learn about the tools they use to explore our universe, experiment to discover whether or not the moon rotates on its axis. do an experiment that demonstrates how a nuclear force can fuse two protons that repel each other.

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Story

What's the Big Idea About Astronomy?

Huge distances, gigantic sizes, and long periods of time—astronomy is a BIG subject. We've brought learning about it down to size with this look at the big ideas you need to know. 

What-Do-You-Know-about-Astronomy

Interactive

What Do You Know about Astronomy?

How much do you really know about our place in space? Test your astronomy knowledge with this interactive quiz. Don't worry, there's no grading—just a helpful look at the answers when you're done! 

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Hands-on Activity

Fusion Simulation

Confused about fusion? You won't be once you've completed this experiment, which demonstrates how a strong nuclear force can fuse two protons that naturally repel each other.

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Curriculum Materials

Telescopes: Super Views from Space

It probably comes as no surprise that telescopes do a better job of collecting light and observing outer space than your eyes. But do you know why? (Hint: the answer is NOT magnification!)

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Curriculum Materials

Building a Simple Refracting Telescope

What could Galileo see when he looked through his telescope? Build a refracting telescope with lenses similar to the ones he used, and see the answer for yourself.

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Curriculum Materials

Space Shuttle Orbiter

Did you know that satellites and the Space Shuttle don't need engines to power their orbits? See how Earth's gravitational pull bends their forward motion and keeps them moving around the planet.

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