Light Pollution Washes Out Night Skies Worldwide, Spurring 'Sky Grief' Among Astronomers

Light pollution is worsening globally, erasing stars from the night sky. Astronomers have termed this loss "noctalgia" or "sky grief."

Ground light pollution combined with proliferating satellites is making night skies 10% brighter over past 50 years.

Loss of night skies damages cultural heritage and animal biology. Circadian rhythms disrupted.

Some regions establish dark sky reserves to limit light pollution, but most areas affected.

Possible solutions include efficient, directed lighting and international cooperation on satellite regulations.