4:09 pm
Wed March 21, 2012

Spacecraft's Wild Ride To Mercury Yields Surprises

The Messenger spacecraft is depicted over the Calvino Crater on Mercury in this enhanced-color image of the planet's surface.
NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington

Originally published on Wed December 12, 2012 5:40 pm

There's a small spacecraft called Messenger that's been orbiting the planet Mercury for a year. Today, at the Lunar and Planetary Science Conference in Houston, astronomers revealed what they've learned about the innermost planet in our solar system, and some of the new knowledge is puzzling.

Maria Zuber, a planetary scientist at the Massachusetts Institute of Technology, studied a large crater 900 miles across called Caloris.

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