Stock Photo - This close-up view shows the docking mechanism of the unpiloted Russian ISS Progress 52 resupply ship as it undocks from the International Space Station's Pirs Docking Compartment at 11:21 a.m. (EST) on Feb. 3, 2014. The Progress backed away to a safe distance from the orbital complex to begin several days of tests to study thermal effects of space on its attitude control system. Filled with trash and other unneeded items, the Russian resupply ship will be commanded to re-enter Earth's atmosphere Feb. 11 and disintegrate harmlessly over the Pacific Ocean.

Stock Photo: This close-up view shows the docking mechanism of the unpiloted Russian ISS Progress 52 resupply ship as it undocks from the International Space Station's Pirs.

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