Tonight, eight in ten Americans
cannot see the Milky Way.
Tonight, eight in ten Americans
cannot see the Milky Way.
The night sky is disappearing faster than almost any other natural feature on Earth. These are the places that fought to keep the dark, and the map of everything we have left.
For all of human history, the night sky was the one view every person on Earth shared. The same band of the Milky Way that guided Polynesian navigators and Lakota star-readers hung over every city and farm and ship at sea. In the span of a single lifetime, most of us have lost it.
A 2016 atlas of artificial sky brightness found that 83 percent of the world's people, and 99 percent of those in the United States and Europe, now live under light-polluted skies. Eight in ten North Americans can no longer see the Milky Way from where they live. It did not go anywhere. We simply lit the air between us and it.
And it is getting worse fast. Using data from thousands of citizen scientists, a 2023 study in Science found the night sky is brightening by nearly ten percent every year. A child born in a place where 250 stars were visible would, by their eighteenth birthday, be able to see only about one hundred.
From their own backyard, the galaxy we live inside is invisible. Source: Falchi et al., the World Atlas of Artificial Night Sky Brightness.
This is the United States at night, seen from orbit. Every glow is artificial light escaping upward into the sky. A century ago, almost none of it existed.
From Boston to Washington, the glow is continuous. The eastern third of the country is, for practical purposes, permanently lit. There is nowhere in it to see a truly dark sky.
A single city throws skyglow hundreds of miles. The dome of light over Chicago is visible from the middle of Lake Michigan. The dark does not end at the city limits.
Out past the Pecos, the map goes black. Big Bend National Park has the darkest measured night skies of any national park in the lower 48.
Across Utah, Arizona, and the Four Corners lies the densest concentration of certified dark places on Earth. Twenty-five in Utah alone.
These pockets survive because people noticed they were vanishing and fought to keep them. There are 139 of them in the country. This is the map.
In 2001 the astronomer John Bortle built a nine-step scale for how dark a sky really is, from a pristine class 1 to the washed-out gray of an inner city. Drag through it.
Most Americans live under class 7 or worse. The certified places on the map ahead are the rare class 1 and 2 skies, where the galaxy still looks the way it did to everyone who came before us.
Tell us where you live. We will estimate how dark your sky really is, and show you what you are missing.
Light pollution is not only an aesthetic loss. The night is a working part of the living world, and flooding it with artificial light has consequences we are only now measuring.
Most North American songbirds migrate at night and steer by the stars. Skyglow pulls them off course and into lit buildings. Up to a billion birds die in collisions in the US each year, with artificial light a leading factor.
Night sky brightness is climbing nearly ten percent annually as cheap LEDs spread. The dark is receding faster than forests, faster than glaciers, faster than almost anything else we track.
At least a third of US outdoor lighting spills uselessly upward. That waste runs to roughly 3.3 billion dollars and 21 million tons of carbon dioxide a year, lighting nothing but the bottoms of clouds.
It reaches us, too. Bright light at night suppresses melatonin and scrambles the circadian clock our bodies kept by the sun and stars for as long as there have been bodies. We did not evolve under a sky that never goes dark, and we are running the experiment on ourselves.
Every one of the next 139 places is dark enough that the Milky Way returns the moment you look up.
Every place in the country certified by DarkSky International, set against the same satellite nightlights. Filter, search, and open any one to see how dark it really is and what hangs overhead.
Designation
Certifications per year. The movement is young, and it is accelerating. The first International Dark Sky Community, Flagstaff, Arizona, was named in 2001.
A dark sky is not simply what is left when a place is empty. Every certified site on this map earned it. Communities passed lighting ordinances. Parks swapped out thousands of fixtures for shielded ones that point down instead of up. Towns voted to trade a little brightness for the return of the stars.
The fixes are almost embarrassingly simple. Shield the light so it falls where it is needed and not into the sky. Make it warmer, under 3000 kelvin, closer to firelight than to a stadium. Turn it down, and turn it off when nothing needs it. Do that across a town and the Milky Way comes back within a few years. It is one of the only kinds of pollution that vanishes the instant you stop making it.
The night is the most reversible thing we have ruined.
Flagstaff, Arizona, proved it could be done, becoming the world's first International Dark Sky Community in 2001. More than a hundred and thirty places in this country have followed. The map above is the record of that work.
A few of the skies still worth the drive. Tap any one to find it on the map.
None of this is gone. It still could be.
The certified places cluster into a handful of unforgettable drives. Pick one to trace it across the map.
Dark skies need a dark moon. Here is every month's new-moon window, with the meteor showers worth planning around.
The night is not a lost cause. It is the rare loss you can reverse from your own porch.
Nothing converts a person like seeing the real thing. Find the certified dark place nearest you on the map, pick a moonless night, and drive out. The Milky Way you have never seen is closer than you think.
The single biggest thing most people can do is change their own outdoor lighting. Four rules cover almost all of it.
DarkSky International runs the certification program behind every place on this map and pushes for better lighting policy nationwide. They are the reason this map exists.
Most light pollution is written into municipal code. A shielded, warm, dark-sky-friendly lighting ordinance is one of the highest-leverage local fights there is, and one of the most winnable. Bring it to your city council.
Most people do not know what they have lost. Show them.
We track the forces reshaping America's public lands, the dark sky among them. Independent reporting, no ads, no paywalls.
25,000+ readers. No ads, no paywalls, leave any time