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Grades 9-12

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Article

Profile: Ole Roemer and the Speed of Light

While studying one of Jupiter's moons, Ole Roemer happened upon the first good estimate of the speed of light. Before his 1676 discovery, scientists assumed that light could not be measured.

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Article

Profile: Vera Rubin and Dark Matter

For every visible star in the observable universe, there are nine masses that are invisible and unidentified. Learn more about the astronomer who proved the existence of dark matter.

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Article

Profile: Lyman Spitzer and the Space Telescope

The idea of launching a telescope into orbit was first suggested in 1923, but the idea wasn't realized until nearly 70 years later. Along the way, there were several obstacles and setbacks.

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Article

Deformed Frogs: The Big Mystery

Frogs with a single hind leg were not the most surprising discovery this seventh-grader from New York made. Read what he learned about the nationwide increase in frog deformities.

Figure 10: Brrr! It was cold in th cave! Note the crevices in the sides and the fallen boulders

Article

My Expedition to the Lava River Cave

To gain a better understanding of volcanoes, this eighth-grader from Arizona decided to go spelunking. Take her tour of the Lava River Cave, formed by a volcanic eruption 675,000 years ago.

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Activity

How the Sun Works

Talk about a long-term power source. For billions and billions of years, the Sun has been giving off energy that equals 4 x 1026 watts. What keeps the Sun burning so bright?

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