By NASA
December 25, 2021
Launch teams monitor the countdown to the launch of Arianespaces Ariane 5 rocket carrying NASAs James Webb Space Telescope, Saturday, Dec. 25, 2021, in the Jupiter Center at the Guiana Space Center in Kourou, French Guiana. The James Webb Space Telescope (sometimes called JWST or Webb) is a large infrared telescope with a 21.3 foot (6.5 meter) primary mirror. The observatory will study every phase of cosmic history– from within our planetary system to the most remote observable galaxies in the early universe. Credit: NASA/Bill Ingalls
The group continues to keep an eye on Webb which is kept in a stable condition in the fairing. The group is monitoring temperatures, relative humidity, and cleanliness of the air getting in the fairing– critical parameters to keep Webb cool, dry, and tidy prior to liftoff.