Artificial light pollution is increasingly obscuring the night sky, leading to billions of people, including over a third of the Earth's population, being unable to see the Milky Way from their homes. This environmental change is impacting human connection to the cosmos, cultural understanding, and psychological well-being.
Cultural and Personal Significance
Mexican photographer Gabriela Reyes Fuchs explored her father's ashes under a microscope, observing patterns that resembled galaxies, which led to a deeper understanding of the connection between human composition and cosmic elements. Planetary scientist Carl Sagan's quote, 'The cosmos is within us, we are made of star-stuff,' resonated with her findings.
Katherine Bennell-Pegg, the first astronaut to train under the Australian flag, described childhood stargazing as the inspiration for her career. Space archaeologist Alice Gorman noted that throughout history, humans have looked to the sky for wonder and connection. However, an estimated 75% of Australian children, and over a billion children globally, live in urban areas where light pollution limits their view of stars. Melbourne teacher Liam Murphy reported that many of his students are unaware that the Milky Way is visible in the sky.
The Growing Challenge: Satellites and Diminishing Dark Skies
The number of artificial satellites orbiting Earth, currently around 12,000, is projected to increase to approximately 100,000 within a decade. Astrophysicist Dr. Brad Gibson stated that the number of satellites is increasing by a factor of 10 every 10 years, making it harder to distinguish stars from satellites.
Astrophotographers like Leonel Padron and Alex Cherney expressed concern over the diminishing dark skies. Mr. Padron mentioned skepticism from individuals who doubt the authenticity of his photographs due to their unfamiliarity with a truly dark sky. Mr. Cherney, based in Melbourne, noted a 9.6% annual increase in average sky brightness in North America and Europe between 2011 and 2021, suggesting a significant reduction in visible stars for future generations.
Well-being, Navigation, and Indigenous Wisdom
Clinical psychologist Dr. Simonne Cohen highlighted that engaging with nature, including stargazing, can improve mental well-being, particularly for children facing a fast-paced, technology-driven world. She emphasized that stars offer hope, wonder, and perspective, aiding emotional regulation.
For centuries, the night sky has served practical purposes. Retired Royal Australian Navy veteran Brendan Naylor explained that celestial navigation by stars is still taught in the navy. Wajarri elder Dawn Hamlett from Western Australia described how her ancestors used the Southern Cross as a compass and relied on celestial markers like the Emu in the Sky to understand seasons and gather food.
Preservation Efforts and Stark Revelations
Despite efforts by some to seek out dark skies for tourism and personal connection, light pollution continues to expand. Astrophotographer Greg Rowney observed noticeable changes even in traditionally dark areas north of Perth. In response, about 16 local governments in Western Australia have implemented dark-sky accredited lighting policies, advocating for warm-colored bulbs, motion sensors, and downward-focused streetlights to minimize light pollution.
A significant event illustrating the extent of lost sky visibility occurred on January 17, 1994, when a power blackout in Los Angeles following a 6.7 magnitude earthquake revealed a star-filled sky to many residents who had never witnessed it before. Dr. Ed Krupp, director of Griffith Observatory, noted that this experience unsettled many, highlighting the public's "bankruptcy of astronomical experience."
The Plane family from Perth shared how stargazing in the outback has provided solace and connection following family tragedies, viewing shooting stars as messages from loved ones.
Preserving dark skies is presented as crucial for maintaining awe, wonder, and humanity's fundamental connection to the universe, reminding individuals of their place in the vast cosmos.