ESA Science & Technology - Installation of JWST's science instruments

With surgical precision, two dozen engineers and technicians successfully installed the package of science instruments of the James Webb Space Telescope (JWST) into the telescope structure. The package, known as the Integrated Science Instrument Module or ISIM, is the collection of cameras, spectrographs and fine guidance systems that help record the light collected by JWST's giant golden mirror.

Inside the world's largest clean room at NASA's Goddard Space Flight Center in Greenbelt, Maryland, the team crane-lifted the heavy science instrument package, lowered it into an enclosure on the back of the telescope, and secured it to the telescope.