Light Pollution and Birds: Migration, Collision, and the Shell L15 Experiment
Roughly one billion birds are killed each year in North America alone by building collisions linked to artificial light at night (ALAN). In Europe the scale is less…
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Satellite Constellations and Light Pollution: Starlink, Kessler, and the New Sky
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 Explained: Causes, Reach, and Why It Stretches 200 Kilometres
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: The Research Framework
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….
How to Measure Light Pollution: Methods, Data, and Research Tools
Light pollution is measured with Sky Quality Meters, calibrated cameras, and satellites — each capturing a different slice of the same problem. LoNNe’s four field intercomparison campaigns, run…
Dark Sky Places in Europe: Parks, Reserves and the Science of Protected Night Skies
Europe has more than 30 IDA-certified Dark Sky Parks and 15 Reserves — the densest network of protected night skies on Earth. Yet 60% of Europeans can no…
How to Reduce Light Pollution: Engineering, Policy, and Ecological Design
Light pollution is solvable. The engineering exists, the policy has been tested, and the evidence is documented. France’s Arrêté of 27 December 2018 imposed legally enforceable curfews, a…
Light Pollution and Human Health: The Science of Darkness, Disrupted
Artificial light at night disrupts human biology at the cellular level — suppressing melatonin, destabilising the circadian clock that governs every organ system, and setting off a cascade…
Light Pollution and Wildlife: How ALAN Destroys Ecosystems
Artificial light at night (ALAN) disrupts the biological rhythms, migration routes, and reproductive cycles of nearly every wildlife group studied — from migratory songbirds to soil bacteria. European…
Light Pollution: Science, Ecology, and Solutions — A European Perspective
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…