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This week in pictures: September 29–October 5, 2012

In the past seven days, astronomers discovered two stellar-mass black holes in globular cluster M22, researchers spied a surprisingly cold region high in the Venus' atmosphere, NASA's Spitzer Space Telescope narrowed down the rate of the universe's expansion, and more.

NASA/JPL-Caltech

Mars Curiosity rover prepares to study martian soil

Mineral analysis can reveal past environmental conditions while chemical analysis can check for ingredients necessary for life. Learn more »
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