Return to Sender: MISSE-6 Comes Home After More Than a Year in Space

It's been eight years since the first Materials International Space Station Experiment, or MISSE, arrived at the orbiting laboratory. During that time, more than 4,000 materials samples have been placed outside the space station to test how they react to the harsh environment of space.The fourth set of test hardware in the experiment series -- MISSE-6A and 6B -- launched aboard space shuttle