Cryogenic Testing of the Webb Telescope's Primary Mirror Segment - Nasa daily picture for September 29 (2021)

In this image from 2011, project scientist Mark Clampin is reflected in the flight mirrors of the James Webb Space Telescope during testing at the Marshall Space Flight Center.

In the intervening years, Webb has undergone a series of increasingly intensive tests and is slated to launch on Dec. 18, 2021.

Before launch the mission will host STEAM Day: A Learning Journey Together, a virtual, interactive event on Sept. 30, for educators and students.

Image Credit: Ball Aerospace

Source: www.nasa.gov