Astronomical observatories enjoy some of the world’s darkest night skies. But even there light pollution is spreading, a new study suggests.
The International Dark-Sky Association’s has summarized more than 300 peer-reviewed studies on the effects of artificial light at night in an effort to help dark-sky advocates.
Astronomers are using tree rings as a historical record of solar activity — and they've found that the Sun was much more active in the past.
Street lights contribute to light pollution, but they are far from the only culprits — and fixing street lights is far from the only solution.
SpaceX's Starlink satellites have come under heavy criticism for their potential to clutter the sky. Here's what a space debris expert has to say about it.
The transition from sodium lights to LEDs, the so-called “lighting revolution”, was supposed to reduce energy consumption and bring back the starry sky, but new satellite data indicate it’s not working out that way.
Ten years ago, La Palma was declared a "Starlight Reserve" and measures were implemented to protect its skies from light pollution. How did they work?