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Earth

Cradle of Life As We Know It

Earth is the only place we know of in the universe that harbors life. Ours is the largest terrestrial planet in the solar system. Our rocky, volcanic world is coated in a thin veneer of liquid water, living things, and translucent atmosphere, whose complicated interactions make Earth's surface into a place of constant change. We humans have only had fifty years of perspective on Earth as a planet, of seeing it as a "pale blue dot" floating in the black vacuum of space.

With that perspective, we know precious and unique our planet is. We know, too, that we are having measurable effects on the complex interactions of ocean, land, life, water, and air, changing our climate. But predicting the future of our climate is hard. Understanding how Earth's systems work by studying the way they operate on other worlds is a major goal of planetary exploration. Mars, Venus, and Titan all have (or had) active geology, hydrology, and weather -- but, as far as we know, they don't have life. Is Earth really that unique? Are we truly alone in the universe? We won't know unless we keep searching.

News from Earth

Looking Backward: Curiosity gazes upon the setting Earth

Posted by Emily Lakdawalla on 2014/02/05 11:58 CST | 8 comments

A few days ago, Curiosity looked westward after sunset and photographed Earth setting toward the mountainous rim of Gale crater.

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Take My Free Online College Introduction to Planetary Science and Astronomy CSUDH Class

Posted by Bruce Betts on 2014/02/05 05:02 CST | 8 comments

Our own Dr. Bruce Betts is once again teaching his Introduction to Planetary Science and Astronomy college course online. Come join him.

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Cosmos with Cosmos Episode 11: The Persistence of Memory

Posted by Casey Dreier on 2014/01/27 11:55 CST | 7 comments

Cosmos stumbles with an episode that is plodding, scattered, and more than a little preachy. This episode will only persist in my memory as a shadow of what could have been.

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Earth's Place in Space

A Pale Blue Dot

Look again at that dot. That's here. That's home. That's us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was, lived out their lives.

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Pictures of Earth by Planetary Spacecraft

Many solar system explorers take dramatic photos of Earth as they depart, or fly by; some even have photographed Earth from the vantage point of another planet.

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The state of Earth observation, January 2012

As of November 2011, the Earth Observing Handbook counts 109 active missions to study the Earth as a planet, with 112 more approved and planned for the future. Jason Davis provides an overview of key current and upcoming earth-observing missions.

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