It was the first US location to get a gold-tier certification from the International Dark-Sky Association, a nonprofit run by a group of astronomers.
To become a gold-tier reserve, areas must meet the highest standards set out by the Dark-Sky Association. Because the Idaho reserve is deep wilderness, there's little to no light pollution anywhere in the area.
As part of the reserve, all the towns in the area have either passed or are working on regulations around nighttime light.
According to the Dark-Sky Association, these regulations include low-glare light bulbs, as well as proper shielding for any lights located in the reserve above 500 lumens.
The area is so dark that "you don’t even have to get off the highway to see the Milky Way," Mayor Botti said.
The goal of the reserve is to protect and enhance the "natural nighttime experience" and "improve quality of life," according to its website.
"We are all made of stardust, and must connect with the night sky to see our origins," Pauley, the retired doctor who was instrumental in creating the reserve, told The Idaho Statesmen in December.