  Artificial light at night is a pollutant that is rising fast, as demonstrated
by Kyba et al. (1) work by analyzing ten of thousands observations by citizen
scientists in the last 12 years. The study found that the dimmest stars are
vanishing, progressively hidden by a 10 percent yearly increase of the sky
background due to artificial lights. This increase is difficult to be detected
by the global coverage satellites now in operation, due to detector's blindness
to the blue peak of white LEDs that are progressively replacing older
technology lamps. This shows the need for a satellite with nighttime multi band
capability in the visible light to study and control future evolution. More
importantly, a call for a strong reverse in the light pollution rising trend is
extremely urgent to avoid all the cultural, scientific, energetic, ecological
and health negative effects of artificial nightlights.
