This week in pictures: September 1–7, 2012
September 7, 2012
In the past seven days, NASA's Dawn spacecraft departed the asteroid Vesta, Curiosity began stretching its arm, scientists discovered unexpected lithium in a star in globular cluster M4, and more.
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A cluster with a secret
A recent survey of the stars in globular cluster M4 has uncovered one sun with more lithium than expected. Learn more »
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