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The week in pictures: July 14–20, 2012

In the past seven days, scientists discovered a grand design spiral galaxy in the early universe, the Spitzer Space Telescope nabbed its first exoplanet candidate, Cassini witnessed daytime lightning on Saturn, and more.
NASA/JPL-Caltech/Space Science Institute

Cassini spots daytime lightning on Saturn

Scientists have deduced that the lightning bolts originate in the clouds deep down in Saturn's atmosphere where water droplets freeze. Learn more »
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