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08.29.08

How Long Would it Take to Walk a Light-Year?

Our experts tackle the big questions that keep you up at night

By Jessica Cheng Posted 08.26.2008 at 4:18 pm 2 Comments

If you started just before the first dinosaurs appeared, you’d probably be finishing your hike just about now.

ET Phone Earth
Here's how scientists are bracing themselves for the moment aliens make contact; and what form it might take
Phoenix Lander Gallery
After landing successfully, the latest craft to reach the Red Planet begins to transmit data
The Hubble Telescope Presents: Galaxies Gone Wild
In celebration of its 18th birthday, NASA has released the largest collection of Hubble images ever.

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