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The week in pictures: July 23–29, 2011

This week's news featured a soccer ball-like planetary nebula, solar "spicules," a trio of galaxies, a new meteor shower, a martian crater, and more.
NASA/SDO/AIA

The Solar Dynamics Observatory spots extra energy in the Sun's corona

Scientists say these magnetic field ripples could be the source of the corona’s intense heating and solar winds. Learn more »
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