Dark Skies

 

Milky Way seen at Curecanti

NPS Photo

Preserving Dark Skies

Light pollution, defined as the excessive use of artificial light, obstructs the view of the Milky Way for 80 percent of Americans. Millions of people worldwide never experience the Milky Way, or even stars, from where they live.

The spread of artificial light affects more than just astronomers and night sky enthusiasts. Nocturnal animals need darkness for survival, and the circadian rhythms of humans and plants rely on an unaltered night sky. Though light pollution is created by a multitude of lights, these problems can be resolved, and possibly reversed over time, with changes to lighting and education.

Curecanti is taking action to preserve its dark skies by responsibly using artificial lighting and offering educational opportunities to learn about astronomy and light pollution. Curecanti—one of several dark sky sites in the Gunnison Valley—was designated as an International Dark Sky Park by DarkSky International. It is the first national recreation area to receive this designation.

 

Sky Quality Meters help us measure and compare sky darkness.

How dark is the sky?

Dark Sky designated locations typically use sky quality meters (SQMs) to measure the darkness of their sky. Readings are usually taken at zenith (the point in the sky directly overhead) and at four other slightly lower points in the sky. SQMs read sky brightness in magnitude per square arcsecond - the higher the number, the darker the sky. The highest possible reading is 23.

As of 2019, parks must have an average reading of 21.2 or higher to be eligible for consideration through DarkSky International. Curecanti's readings have averaged 21.3 since its designation in 2021. Readings approach 22 at remote park sites such as Great Basin, Big Bend, and Natural Bridges. Big cities such as Denver, Colorado have readings around 18.

 

Telescope viewing programs are offered at the Elk Creek Campground

NPS/Kat Connelly

Astronomy Programs

Park rangers present evening programs at the Elk Creek Campground amphitheater on astronomy and telescope viewing. Check the park calendar for upcoming offerings.

The Gunnison Valley Observatory has a long history of partnership with Curecanti in providing astronomical experiences to visitors and residents. The observatory is located outside Gunnison, CO (east of the recreation area) and hosts programs during the summer.

For Kids

Check out the Junior Ranger Night Explorer program, which encourages young park visitors to explore the starry side of their national parks. Activities include learning about stars and galaxies, writing creative mythology about constellations, and using all senses to explore the night environment at a national park. Pick up a free booklet from the visitor center or download online.