The James Webb Telescope (JWST) will be launched into space in 2021 instead of the iconic Hubble Space Observatory, which has been in space since 1990 and is already falling apart. The last completed Hubble mission took place in 2009, after which the telescope simply collects data about the Universe, however, three of its six gyroscopes have already stopped their work.
The diameter of the mirrors of the Webb telescope is 6.5 m, while this part of the Hubble telescope does not exceed 2.4 m. In addition, the telescope will study the sky not only from ultraviolet to near-infrared but also at longer waves – this allows him to see the galaxies of the early universe.
A heat shield is designed to protect telescope mirrors from heat and radiation fluxes from the sun. Each layer of the screen is coated with aluminum, and two layers of doped silicon are applied to it.
During the last stage of the test, scientists were convinced that the mirror opening mechanism works correctly. Using an internal electronics system, engineers deployed two side mirrors and turned them into one large mirror surface. Testing was successful.