Milan (before change to LED lights)

Astronomy and Society

The Lost LED Revolution: Light Pollution Is Increasing

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.

Light Pollution Map - Canary Islands

Save Dark Skies

Starry Success: Protecting the Night Sky Above La Palma

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?

Save Dark Skies

Measuring the Impacts of Light Pollution

Light pollution is pervasive, and its impact on people is larger than you might think.

M31

Celestial Objects to Observe

111 Deep Sky Wonders for Light-Polluted Skies

Bright skies aren't empty skies. See for yourself how many treasures lie hidden in the glow of a city sky.

Astronomy Questions & Answers

Will meteor showers be enchanced if you fly 3,000 feet above the ground in an airplane?

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…

Moon's skyglow

Hobby-based Q&A

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…

Astronomy Questions & Answers

What’s the difference between nebula filters and light-pollution filters?

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…

Winter constellations seen in a class 4 or 5 sky

Save Dark Skies

Gauging Light Pollution: The Bortle Dark-Sky Scale

Excellent? Typical? Urban? Use this nine-step scale to rate the sky conditions at any observing site.

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