Integrated Science Instrument Module (ISIM) Structure
The Webb telescope's Integrated Science Instrument Module (ISIM) Structure is undergoing tests at NASA's Goddard Space Flight Center in Greenbelt, Md. In this photo, the ISIM was placed in a "Helium Shroud" that was placed into the Space Environment Simulator (SES) Chamber. The SES is a big vacuum chamber where scientists and engineers cryo-tested the ISIM and lowered the temperature of the structure to 42 Kelvin (-384.1 Fahrenheit or -231.1 Celsius) and below to ensure that it can withstand the frigid temperatures of space. A specially designed camera can be seen hanging from the ceiling. The engineer in this image is Paul Cleveland of NASA Goddard.
Credit: NASA, Chris Gunn
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Taken on July 20, 2010