The James Webb Space Telescope, scheduled for launch 18 December 2021, will be the most powerful space telescope ever launched (Vox, NASA). A launch will be considered successful upon a successful Ariane 5 main stage separation (Arianespace, WebTelescope.org).

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NOTE 24 September 2021: When launch, the question read "...before 1 January 2023." It has been revised to "...before 1 January 2022."

The question closed "Yes" with a closing date of 25 December 2021.

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