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The week in pictures: January 26 – February 1, 2013

In the past seven days, Venus Express discovered that our sister planet’s ionosphere balloons out like a comet’s tail, the Herschel Space Observatory captured cool new images of Andromeda Galaxy, and Cassini watched a Saturn storm choke on its own tail, and more.
Credit: ESA/C. Carreau

NASA joins ESA’s "dark universe" mission

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