Which major astronomical observatory became the world's first carbon-neutral observatory in 2021, implementing a comprehensive sustainability program including solar power and rainwater harvesting?

Many astronomy organizations and observatories are now implementing significant sustainability initiatives to reduce their environmental impact while studying the cosmos. From renewable energy powering telescopes to carbon-neutral facilities, the astronomy sector is embracing eco-friendly practices. Test your knowledge about one major observatory's groundbreaking sustainability achievement that made headlines in the astronomy community!

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• European Southern Observatory's Paranal Observatory in Chile
• Mauna Kea Observatories in Hawaii
• ALMA Observatory in the Atacama Desert
• Kitt Peak National Observatory in Arizona

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