Which sustainable innovation has NASA's Jet Propulsion Laboratory implemented to reduce the environmental impact of deep space communications?

Modern astronomy isn't just about observing the stars—it's also about sustainable practices in space exploration and operations. Major observatories and space agencies are implementing eco-friendly initiatives to reduce their environmental impact while continuing to advance our understanding of the cosmos. This poll tests your knowledge of how the astronomy industry is embracing sustainability in its operations and technology development.

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Solar-powered cryocooling systems that reduce helium consumption by 80% at deep space network facilities
Biodegradable satellite components that dissolve harmlessly upon atmospheric reentry
Carbon-negative rocket fuel derived from atmospheric carbon capture technology
Zero-waste observatories that convert all facility waste into telescope mirror coating materials