人为的夜空亮度

人为的夜空亮度

ByNASA中文

2023年3月8日 Artificial Night Sky Brightness Image Credit: Data: JPSS Satellites; Processing: David J. Lorenz Explanation: Where have all the dim stars gone? From many places on the Earth including major cities, the night sky has been reduced from a fascinating display of thousands of stars to a diffuse glow through which only a few stars are visible. The featured map indicates the relative amount of light pollution that occurs across the Earth. The cause of the pollution is artificial light reflecting off molecules and aerosols in the atmosphere. Parts of the Eastern United States and Western Europe colored red, for example, have an artificial night sky glow over ten times that of the natural sky. In any area marked orange or red, the central band…

乡村与都市夜空的对比

乡村与都市夜空的对比

ByNASA中文

2020 April 8 Country Sky versus City Sky Image Credit & Copyright: Tomas Slovinsky; Text: Matipon Tangmatitham (NARIT) Explanation: Dark skies are disappearing from the world. With modernization comes artificial lighting that brightens the night. While these lights allow modern humans to see, much light is wasted up into the sky. This light pollution not only wastes energy, but, when reflected by the Earth’s atmosphere back down, creates a nighttime brightness that disrupts wildlife and harms human health, while doing very little to prevent crime. Light pollution is also making a dark night sky a scarcity for new generations. While there is little that can be done in large cities, rural country areas could benefit from lighting that is fully shielded from exposing the night…