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Profile: Ernst Chladni and Rocks from the Sky

Today, we accept the notion that enormous rocks exist within our solar system and that some of them fall to Earth. A little over 200 years ago, though, this idea garnered skepticism and ridicule.

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Case Study: John Michell And Black Holes

Imagine gravity so strong that even light is contained by its force. When a country parson first described black holes in 1783, the concept was so ahead of its time that it was mostly ignored.

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Case Study: Fossil Microbes on Mars?

A meteorite that escaped from Mars 16 million years ago was found recently in Antarctica. Does it, or doesn't it, hold evidence that proves the existence of life on the red planet?

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Case Study: Neutrino Observatories

Update your image of astronomers. Today they spend most of their time peering into computer screens rather than through the eyepiece of a telescope. Learn what this new vantage point has gained them.

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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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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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