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?