The James Webb Space Telescope is confirmed for the target launch date of December 24, at 7:20 a.m. EST.

Late on December 17, teams at the launch site successfully completed encapsulation of the observatory inside the Ariane 5 rocket that will launch it to space. Webb’s final launch readiness review will be held on Tuesday, December 21 and, if successful, roll-out is planned for Wednesday, December 22.