Webb Telescope's Fine Guidance Sensor
This close up photo of the Fine Guidance Sensor/Near InfraRed Imager and Slitless Spectrograph (FGS/NIRISS) was taken in the giant cleanroom at NASA Goddard Space Flight Center in Greenbelt, Md. as it awaits more attention from the surrounding engineers.
The FGS is the device that will provide exquisite pointing and guiding control of the observatory for all of Webb's science instruments. The NIRISS will assist in detecting the universe's first light, and detect and characterize exoplanets and their movement across (transit) stars. The FGS/NIRISS is the Canadian Space Agency's contribution to the Webb mission, and it arrived at NASA Goddard on July 30, 2012.
Credit: NASA Goddard/Chris Gunn
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Taken on August 10, 2012