A decently dark site in a rural area has a sky background of about 21 mag/arcsec 2. In the Rocky Mountains in Colorado I’ve been to sites a bit darker than this, and it’s truly spectacular.

Of course the sky is dark at night ... re talking cosmologically dark, however: the universe itself is in a state of being unlit. There are some sources of background light even then—distant ...

April 21 - 28 is International Dark Sky Week, a global celebration of the night sky during which like-minded organizations and people take action to raise awareness of an inevitable aspect of ...

While in Teton County, don't forget to look up at night. Teton County in Wyoming just became the first county in the world to be certified as an International Dark Sky Community. It's also home to ...

It's been almost two years since Apple's Weather app absorbed the popular Dark Sky app that Apple acquired in 2020. And now iOS 18 is promising to bring a couple of Weather upgrades that will ...