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Large changes in the sun's energy output may drive unexpectedly dramatic fluctuations in Earth's outer atmosphere, new research indicates. A study published today links a recent, temporary shrinking of a high atmospheric layer with a sharp drop in the sun's ultraviolet radiation levels.

While the common perception of asteroids is that they are giant rocks lumbering about in orbit, a new study shows they actually are constantly changing "little worlds" that can give birth to smaller asteroids that split off to start their own lives as they circle around the sun.

A new study of the High Arctic climate roughly 50 million years ago led by the University of Colorado at Boulder helps to explain how ancient alligators and giant tortoises were able to thrive on Ellesmere Island well above the Arctic Circle, even as they endured six months of darkness each year.

A team of eight institutions that includes the University of Colorado at Boulder has been selected by the Federal Aviation Administration to participate in a newly formed Center of Excellence for Commercial Space Transportation.

Postdoctoral fellows and graduate students from Professor Mark Hernandez's environmental engineering lab at the University of Colorado at Boulder will travel to the Gulf Coast this week to begin studying the effect of this summer's oil spill on air quality along impacted shores.

DENVER—University of Colorado campuses and undergraduate programs remain well-regarded at the regional and national levels among public and private universities, according to the 2011 edition of U.S. News & World Report's Best Colleges.

A planned $110 million telescope in Chile that the University of Colorado at Boulder is partnering on to probe distant galaxies and stellar nurseries has been named as the top construction priority for mid-sized, ground-based telescopes by the National Research Council in the coming decade.

Anchored by a 900-seat street-market style dining hall offering freshly prepared food in nine specialty dining stations, including sushi, Italian, Brazilian and Persian dishes, the nearly completed Center for Community at the University of Colorado at Boulder is set to open for students this fall.

A thick blanket of yellow haze hovering over Houston as a result of chemical pollution produced by manufacturing petroleum products may be getting a little bit thinner, according to a new study.

The University of Colorado at Boulder and the U.S. Department of Energy's National Renewable Energy Laboratory in Golden today named Michael L. Knotek as director of the Renewable and Sustainable Energy Institute, or RASEI.