Go outside at night when the sky is clear and look around frequently, you may see fewer stars than your grandparents did when they were younger. And it’s not just an illusion; Satellite measurements now show that Earth is becoming brighter at night due to the rapid spread of artificial light. As man is developing cities and rural areas, he is changing the darkness of nature. What was once a serene starry sky is slowly but surely vanishing into a blanket of light.
satellite data and the rise of night time glow
The latest studies using satellite measurements have shown that an interesting pattern is emerging: our planet is getting brighter at night, but the process is neither linear nor uniform. For example, NASA’s changes in nighttime illumination between 2012 and 2023 – the EIC version showed an overall 16% increase in nighttime illumination levels globally.This phenomenon is particularly attractive because it is multidimensional. Researchers describe night-time lighting conditions on Earth as “highly unstable”, constantly changing as some areas become brighter and other areas darker.The conclusion was reached by analyzing millions of satellite photographs processed through NASA-funded algorithms, thus providing significantly more detail than previous studies on the matter.Simply put, our planet is not only getting brighter; It is doing so in a dynamic manner, reflecting human activity and other factors such as blackouts and military operations.
due to light pollution and global brightness
According to the Leibniz Institute of Freshwater Ecology and Inland Fisheries, increasing artificial lights at night are the primary cause of this increase in brightness, otherwise known as light pollution.The areas of the world that saw the biggest increase in brightness include sub-Saharan Africa and Southeast Asia. Urbanization and increasing electrification of these areas have been the primary reasons for the increase in brightness levels.Also, technological advancements in lighting have made significant contributions. While LEDs are more efficient, they provide more light due to their intensity and coverage.Artificial light at night is now a global disruptor of darkness. Still, not all places in the world are getting brighter. For example, parts of Europe have taken steps to reduce artificial light.
Impact of bright nights on environment and health
The implications of the increased brightness of the night sky go much deeper than depriving us of a starry night. For a long time, scientists have been aware of the fact that light pollution is harmful to the functioning of ecosystems. It affects nocturnal ecosystems, animal migration, and human circadian rhythms.Many species depend on darkness and light to survive. Birds are guided by light, insects orient themselves with its help, and the activities of plants depend on the alternation of night and day. Artificial light disrupts natural processes, which has negative consequences.The effects of artificial light are less obvious on humans. Our body’s internal clock requires darkness to regulate our sleep cycles, and increased light at night may be linked to more serious health problems. There is also a cultural dimension involved: many people can no longer observe the Milky Way because of light pollution.However, in all its aspects, it is a clear indicator of how we impact the nature of the Earth. While evolution brings undeniable benefits, it also challenges us to find a balance so that progress does not come at the cost of losing natural night altogether.