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Grades 9-12

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Article

Digital Images: The Universe Exposed

For most of human history, recording a star meant describing it with words or drawing a picture. The 19th-century invention of photography changed that—only to be revolutionized by digital imaging.

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Curriculum Collection

Filtering Light

All the color photos of astronomical phenomena that we see in magazines and books begin as three separate images—one red, one green, and one blue. Explore how CCD cameras and their color filters work.

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Article

The 3-D Universe

A 2-D map is a great guide here on Earth—and virtually worthless for finding your way around in outer space. Take a 3-D look at mapping our solar system and universe.

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Curriculum Materials

Parallax

When it comes to observing stars, our eyes have their limitations. Take a look at how astronomers combat these limits and accurately measure the distances between celestial bodies.

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Article

Gravity: It's Universal

We owe our lives to gravity. It holds the atmosphere to Earth and keeps us all from falling off into space. Not to mention that without gravity, the stars and planets—including Earth—wouldn't even exist!

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Curriculum Collection

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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Article

Safety and Wintering Over in Antarctica

Antarctica's winter runs from mid-February through late August. If you decide to stay, you're there for the duration—all aircraft traffic is stopped. Learn how research crews prepare to go it alone.

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Article

Sea Ice and Climate in Antarctica

At the poles, it's possible to study sea ice that's 3,000 years old. Find out what scientists learn by cutting up ice cores and seeing the ice crystals' many different textures and colors.

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Classroom Activity

Crazy Cold Air

Why does cold air rush out of a freezer when you open the door? How does it then move through a room? Experiment to learn the answers—and gain insight into the blustery winds of Antarctica.

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