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A galaxy hunter takes a last look, the Milky Way shines, and auroras shimmer in this week's best space pictures.
<b>63 light-years</b>: the distance from Earth to the blue exoplanet HD 189773b, which looks like a cozy place to live—except its surface temperature is 1,000 degrees Celsius and it rains glass. Sideways.<p><b>5.5 million square feet</b>: the floor space of the new world's largest building, which could fit 20 …