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.
Concerned about light pollution? Join a virtual conference this weekend that looks at ongoing global efforts to mitigate it.
Light pollution is insidious in today’s world. This International Dark Sky Week, become inspired to see what you can do to raise awareness.
Street lights contribute to light pollution, but they are far from the only culprits — and fixing street lights is far from the only solution.
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?
I recently got my pilot license. Will meteor showers be enhanced at all for my girlfriend and me in a low-winged Tomahawk airplane, flying 3,000 feet above the ground?There are several tradeoffs to consider. True, you’ll be 1 kilometer closer to the meteors overhead. But most of them flash into…
How does the Moon's phase affect the skyglow of any given location, and how many days before or after a new Moon is a dark site not compromised?
How does the Moon's phase affect the skyglow of any given location? How many days before or after a new Moon is a dark site not compromised? The answer is complicated because the Moon's glow is even more directional than light pollution. Skyglow is several times brighter near the Moon…
What’s the difference between nebula filters and light-pollution filters? Nebula filters block out most of the visible spectrum while transmitting the handful of finely tuned colors that emanate from the most luminous constituents of cosmic gas clouds: hydrogen atoms and oxygen ions. Light-pollution filters, by contrast, are designed to block…
Excellent? Typical? Urban? Use this nine-step scale to rate the sky conditions at any observing site.