Which major observatory became the world's first carbon-neutral astronomical research facility in 2019, implementing renewable energy systems that generate 100% of its operational power needs?

In the vast field of astronomy, sustainability initiatives have become increasingly important as observatories and space agencies work to minimize their environmental impact while gazing at the stars. From energy-efficient telescope designs to carbon-neutral operations, astronomical organizations are pioneering eco-friendly approaches to space science. Test your knowledge about one of astronomy's most significant sustainability breakthroughs!

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European Southern Observatory's Very Large Telescope (Chile)
Mauna Kea Observatories (Hawaii)
Roque de los Muchachos Observatory (Canary Islands)
South African Large Telescope (SALT)