The secondary sight has a diameter of 74 cm and must transmit the light captured by the main mirror to the instruments.
The ambitious successor of the mythical Hubble Space Telescope (HST), the JWST will be able to see in the infrared up to 200 million years following the Big Bang and thus observe the light of the first galaxies and stars.
It should also allow us to learn more regarding exoplanets.
The deployment of the main mirror, with a diameter of 6.5 meters, is now expected.