David Owen:

The day after Dave Crawford and I inspected nighttime Tucson, I drove five hundred and fifty miles north to Bryce Canyon National Park, in southern Utah. That evening, I joined about two hundred people, including many children, outside the visitors' center, where telescopes of various sizes had been set up in the parking lot. Several were equipped with computerized tracking devices, which could be programmed to find and follow interesting objects in the sky. At one station or another, I saw the four Galilean satellites of Jupiter (tiny dots in a line), Saturn (with rings), a dense group of old stars, known as a globular cluster, a pair of twin stars (one blue and one gold), and the mountains and valleys that Galileo saw on the moon. With just my own eyes, I saw the orbiting Hubble Space Telescope, which rapidly crossed the sky just before eleven o'clock, and, a little later, I saw the meteor-like flash of a passing Iridium satellite.

I spoke with Chad Moore, the program director of the National Park Service's Night Sky Team. "Many people who come to our programs have never really looked at the night sky," he told me. "A woman once came up to me and said, 'The moon was out during the day this morning -- is that O.K.?' "

I laughed out loud when I read that last sentence.

Here's a photo I took of the daytime moon in Bryce Canyon:

And for good measure in reference to Bruce Sterling's photos of a recent Texas fire, here are two of a 2009 fire at Bryce Canyon:

In Galileo’s time, nighttime skies all over the world would have merited the darkest Bortle ranking, Class 1. Today, the sky above New York City is Class 9, at the other extreme of the scale, and American suburban skies are typically Class 5, 6, or 7. The very darkest places in the continental United States today are almost never darker than Class 2, and are increasingly threatened. For someone standing on the North Rim of the Grand Canyon on a moonless night, the brightest feature of the sky is not the Milky Way but the glow of Las Vegas, a hundred and seventy-five miles away. To see skies truly comparable to those which Galileo knew, you would have to travel to such places as the Australian outback and the mountains of Peru. And civilization’s assault on the stars has consequences far beyond its impact on astronomers. Excessive, poorly designed outdoor lighting wastes electricity, imperils human health and safety, disturbs natural habitats, and, increasingly, deprives many of us of a direct relationship with the nighttime sky, which throughout human history has been a powerful source of reflection, inspiration, discovery, and plain old jaw-dropping wonder.