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Article, Online Resource

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, Online Resource

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, Online Resource

Profile: Fritz Zwicky's Extraordinary Vision

Astronomer Fritz Zwicky was the first person to conceive of supernovas, neutron stars, dark matter, and gravitational lenses. So why don't more people know his name?

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Article, Online Resource

Brown-Eyed, Milk-Giving

Which regions of the world have seen the greatest rates of mammal extinction? Surprisingly, it's not the Amazon rain forest nor the clear-cut forests of the U.S. or Africa's Serengeti plain.

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Article, Online Resource

Reefs in Crisis

Humans have harmlessly harvested coral reefs for thousands—or even hundreds of thousands—of years. So why has our behavior in recent years suddenly put reefs at risk?

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Article, Online Resource

Jaguars

Because they feed on everything from monkeys and pacas to armadillos and alligators, jaguars play a key role in the rain forest ecosystem. Learn how protecting them safeguards the jungles of Belize.

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Article, Online Resource

The Green Guerillas

From a humble start 25 years ago tossing seed-filled water balloons into abandoned city lots, the Green Guerillas have grown into an organization that has created and maintains 1,000 urban gardens.

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Article, Online Resource

Wilderness Preservation Act

There are more than 260 distinct ecosystems in the United States. Yet only a little over half of them are in protected wilderness areas. What does it take to obtain "wilderness status"?

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Article

St. Lucia Parrot Recovery

In the mid-1970s, only 100 of these parrots were left in the wild. Learn how an international effort more than tripled the St. Lucia parrot population in 20 years.

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