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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
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ScienceShot: Asteroid Vesta Exceeds Expectations
3 October 2011 2:01 pm
The 529-kilometer-diameter asteroid Vesta is revealing even more geologic diversity than scientists had expected. They knew that a collision with another asteroid had splashed off three kinds of rock that still land on Earth as meteorites. And Vesta's overall spectral color, as returned by NASA's orbiting Dawn spacecraft, matches that of these Vesta meteorites, Dawn team members reported today at a planetary science meeting in Nantes, France. But rather than a monotonously uniform surface homogenized by impact cratering over the eons, the first up-close look at the asteroid reveals a full palette of mineral "colors" (mapped here in false color reflecting the wide range of rock compositions). Researchers will now have to sort out how more than 4 billion years of impacts—including one at the south pole that nearly destroyed the asteroid—reshaped Vesta after it developed a crust, mantle, and core much like Earth's.
See more ScienceShots.