Webb’s secondary mirror successfully deployed

In another major milestone for the James Webb Space Telescope, a motor-driven tripod unfolded as planned Wednesday, moving a 2.4-foot-wide secondary mirror into position to reflect collected starlight back down to the instruments that will study it. While the deployment of a tennis court-size sunshield Monday and Tuesday marked the most technically challenging hurdle for Webb’s initial activation, getting the secondary mirror in position was equally critical to the success of the $10 billion mission. More

(Source: SpaceFlight Now - Jan 6)