Mirror deployment is expected to begin in earnest Wednesday morning.
The timeline apparently changed as Tuesday wore on. During a news conference early Tuesday afternoon, for example, mission team members said mirror deployment likely wouldn't begin in earnest for a few more days.deployment systems lead at NASA's Goddard Space Flight Center in Greenbelt, Maryland, said during the news conference."But then it runs for about 10 days. That whole mirror deployment is a 10-day period.
Webb's secondary mirror is so named because it's the second surface, after the primary, that light will hit on its way into the telescope's four science instruments. The 2.4-foot-wide secondary mirror sits at the end of several booms, which must be extended. The secondary mirror will be deployed first. That operation is preceded by heating up the motors that deploy the mirror structure — an activity that Stewart said would begin on Tuesday night.
"Following that, the next two days, we'll start heating [motors] in preparation for the wing mirror deployments," he said during Tuesday's news conference. Timeline shifts are not terribly surprising or concerning; team members have stressed repeatedly since the observatory's
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