You are looking at the largest piece of tin foil in the planet, one of the James Webb Space Telescope‘s sunshield membranes. There will be five of these membranes, which will keep its core at 50 Kelvin (-223.15C).
With the Hubble Space Telescope quickly coming to the end of its long and illustrious career, a new non-terrestrial observatory will be necessary to continue deep-space research into the origins of the universe. Why hello there, James Webb Space Telescope.