MISSE-8
The STS-134 mission, launched May 2011, delivered the MISSE PEC8 experiment and returned MISSE PEC7A & PEC7B to earth. MISSE-7 had been on the ISS since its delivery on STS-129.
On STS-134 MISSE-8 was only one PEC, STS-135 crewmen added the MISSE-8 ORMatE-III exposure plate to the second MISSE mount.
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Astronaut Andrew Feustel swaps the MISSE PEC7A & 7B with PEC8 STS-134
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A composite of photos taken during an STS-135 EVA of the overall ISS from ELC-2, note MISSE-8 PEC on the right
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MISSE-8 & the ORMatE-III plate design
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MISSE-8 as photographed by Ron Garan STS-135
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MISSE-8 ORMatE-III plate from NASA Select TV
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MISSE-8 ORMatE-III exposure plate placed on ELC-2 during a spacewalk STS-135
Read more about this topic: Materials International Space Station Experiment