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The week in pictures: February 16–22, 2013

In the past seven days, astronomers began to develop a system to identify dangerous asteroids before their final plunge, scientists think 120-mile-long Tinto Vallis formed around 3.7 billion years ago, Cassini detected a significant acceleration of electrons in a quasi-parallel shock on Saturn, and more.

ATLAS: The Asteroid Terrestrial-impact Last Alert System

Astronomers are developing a system to identify dangerous asteroids before their final plunge to Earth. Learn more »
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