Artificial light at night (ALAN) fundamentals — sky brightness, measurement methods, and the global spread of light pollution across urban and rural landscapes.
By early 2025, SpaceX had more than 6,000 Starlink satellites in orbit — a single company’s constellation exceeding the entire pre-2019 population of active spacecraft. Add Eutelsat OneWeb’s…
Skyglow is the atmosphere’s answer to artificial light — not the light itself, but the scattered fraction that returns earthward as a diffuse luminous haze. Falchi and Cinzano’s…
ALAN — artificial light at night — is the scientific term for every photon emitted by human infrastructure after dark, regardless of whether it serves a useful purpose….
Light pollution is the excessive or misdirected artificial light that brightens the night sky, disrupts ecosystems, and impairs human health. Unlike the US-dominated discourse on this subject, this…
