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Fifty years after the first mention of light pollution in Science, thejournal recently elevated this topic to the cover of its 16 June 2023 issue,highlighting the large impact on human and ecological health, circadianrhythms, migratory patterns, and more. We offer here the term noctalgia toexpress "sky grief" for the accelerating loss of the home environment of ourshared skies - representing loss of science, heritage, millennia-old skytraditions, place-based language, and more - and summarize next steps toaddress the protection of our nighttime and daytime skies.

Noctalgia (sky grief): Our Brightening Night Skies and Loss of Environment for Astronomy and Sky Traditions