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Carolyn Collins Petersen
Guide since 2014


About.com Space / Astronomy

Dark Skies are our Heritage

Have you ever heard of light pollution? It's the overuse of light at night. Nearly everyone on Earth has experienced it. Cities are bathed in light, but lights also encroach on the wilderness and rural landscapes as well. The International Dark-Sky Association is a leading authority on light pollution, its causes, and ways to reduce it while preserving safety and security. Check out their Web site, and their video "Losing the Dark", available to watch on Youtube and Vimeo, and downloadable for educators, planetariums, and other outreach professionals.

Learn More and Watch a Video!

Peeking at August Skies

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Want to see some planets after sunset this week?  Look to the south-southwest for a view of Mars and Saturn. You'll also be able to spot a nice crescent Moon appearing near the planets on the nights of the 1-4th. 

Learn More About the Sky
Space / Astronomy Spotlight10

When Galaxies Collide!

Galaxy collisions and star formation are the order of business in the universe.

Discovering and Imaging Alien Worlds

A story about planetary imaging and discovery using the Gemini Planet Imager.

Existence in an Infant Solar System

A look at research showing what life was like on Earth back in the days when bombardment helped change our planet's surface and atmosphere.

Share the Sky with Others

A look at six groups involved in space science and astronomy education and science advocacy.

The Latest from Enceladus

A look at the latest discovery at Enceladus, Saturn's frozen and fascinating watery moon.

Five Cool Space Education Resources

A look at five (of many) online and real-world resources for space exploration education.

A Personal Tour of Astro-Education Resources

A short look at a few of the many science education resources for teachers, professors, and outreach professionals.

A Black Hole Cannibal at the Heart of the Milky Way

Our galaxy's central black hole gives hints about how supermassive black holes grow.

Want to Find Life? Study a Sunset!

A look at Titan and how sunsets there help astronomers understand distant planet atmospheres.

Five Fun Ways to Learn about Astronomy

A quick look at some ways to start learning astronomy that involve books, software, TV, movies, and a visit to your local planetarium.

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