The word "skyglow" refers to the artificial brightness of the night sky caused by urbanization and excess lighting. It is commonly spelled with the two separate words "sky" and "glow", however, its phonetic transcription suggests that it should be spelled as a compound word with a single syllable. The IPA transcription of "skyglow" is /ˈskaɪɡləʊ/, with the stress on the first syllable. This proper spelling is important for clear communication, especially in scientific contexts where accurate terminology is crucial.
Skyglow refers to the pervasive glow or luminous halo that appears over populated areas when artificial lighting is excessively emitted into the atmosphere during nighttime. It is a form of light pollution that results from the scattering and diffusion of light by atmospheric particles such as dust and moisture, along with the reflection and absorption of light in the atmosphere. As a consequence of modern urbanization and industrialization, the excessive and uncontrolled use of artificial lighting sources, such as streetlights, billboards, and buildings, contribute to the skyglow phenomenon.
This luminous halo, also known as artificial sky brightness, diminishes the visibility of stars, planets, and other celestial objects, obscuring the natural beauty of the night sky. Skyglow not only impacts astronomical observations and stargazing experiences but also has ecological and health implications. It can disrupt the natural rhythms and behaviors of nocturnal species such as birds, insects, and even sea turtles, affecting their migration patterns, feeding habits, and reproduction.
Efforts to mitigate skyglow include implementing more efficient lighting systems such as LEDs, which direct light downwards and reduce upward light waste, shielding lights to prevent their emission in unwanted directions, and promoting the use of dark sky-friendly fixtures and designs. By reducing skyglow, cities and communities can not only restore the wonder and awe of the night sky but also minimize energy waste and associated environmental impacts, creating a healthier and more sustainable nighttime environment.
The word "skyglow" is a combination of two words: "sky" and "glow".
- "Sky" comes from the Old Norse word "ski" which means "cloud".
- "Glow" is derived from the Old English word "glowan" which means "to shine or glow".
When these two words are combined, "skyglow" refers to the phenomenon where the night sky is illuminated by artificial light sources, resulting in a haze or glow above populated areas.