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Article

Article: One in a Million

Have you ever stumbled upon a discovery while looking for something completely different? See what surprises astronomers found as part of the Sloan Digital Sky Survey.

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Article

Article: The Big Questions

What is the Universe’s arrangement today? What did it look like at its birth? And how did we get from then to now? These are just some of the “Big Questions” astronomers are making headway answering.

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Article

Essay: Stars in Exquisite Accuracy

There’s only one star that astronomers have a firm grasp on: the Sun. Fundamental facts about other stars remain elusive. Find out how a powerful interferometer atop Mount Wilson in Southern California hopes to change that.

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Article, Science Bulletins

The Shining Star of South African Astronomy

On cloudless, moonless nights, the stars are so bright over the remote village of Sutherland, South Africa, that a person can walk by starlight alone. Learn more about the village’s Southern African Large Telescope (SALT).

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Article

The Enigma of High Energy Cosmic Rays

In 1912, Viktor Hess took to the sky in a hot-air balloon and discovered a radioactive energy now called “cosmic rays.” Travel to Argentina to see how scientists now hope to discover at long last where the highest-energy cosmic rays are coming from.

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Article

Expedition for an Ice Core

By analyzing the relics glaciers hold — compacted snow and trapped air from ancient atmospheres, ash from long-quiet volcanoes, dust, insects, and pollen — scientists can reconstruct hundreds of thousands of years of Earth’s climate.

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Article

The Coming and Going of an Ice Age

In the past two million years alone, Earth has experienced around 20 ice ages — cycles of advance and retreat of large continental ice sheets. When is the next one due? And will global warming change that due date?

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Article

Rapid Change in a Warming World

Climate change isn’t always slow, small, and imperceptible in a human lifetime. Ice core analysis has found a single decade in which temperatures over Greenland shot up about 15 degrees Celsius.

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Article

The Climate Jump Heard 'Round The World

Scientists know that the unusual and rapid temperature jump of the Younger Dryas was felt over half the globe. But they're only now beginning to understand why.

Interactive

Interactive: Watch a Glacier Melt

Qori Kalis is the largest outlet glacier of Peru's Quelccaya ice cap. See firsthand how it (like all tropical glacier ice) is melting because of global warming.

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