Which sustainable innovation was implemented during the development of the James Webb Space Telescope to reduce its environmental impact?

The James Webb Space Telescope (JWST) represents not just a technological marvel but also showcases sustainability innovations in space technology development. Despite being one of NASA's most ambitious projects, the JWST team incorporated various sustainable practices during its design and manufacturing. This poll tests your knowledge about how sustainability principles were applied in the development of this groundbreaking astronomical instrument that's revolutionizing our view of the universe.

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Use of recycled gold for the telescope's primary mirrors, reducing new mining impact
Implementation of a closed-loop cryogenic testing system that reduced liquid helium consumption by 90% compared to previous telescope testing
Powering the telescope with experimental solar panels that generate 3x more energy than conventional arrays
Construction using biodegradable composite materials designed to minimize space debris