Circumzenithal arcs look like upside-down rainbows, but they're caused by ice crystals, not rain. They're sometimes seen with sundogs, and even full halos around the sun or moon.

Many people recognize the Big Dipper in the northern sky. Here are 10 deep-sky Messier objects - 8 galaxies, a planetary nebula, and a double star - in and around the Big Dipper.

Striking contrail shadow image from the magical sunset skies of northern New Mexico.

"Have you ever woken up from a dream and the view was still there?"

Noctilucent clouds - aka night-shining clouds - can be seen at high latitudes in summer, typically beginning for northern latitudes in late May. French photographer Adrien Mauduit in Denmark assembled his best 2016 photos into a wondrous video.

They were the brightest objects nearly all night Sunday night, as seen from around the world. Here are a few photos from the EarthSky community. Thanks to all who submitted!

The starry band of the Milky Way before dawn in early May. Add in a chorus of wildlife, and you have a stargazing experience to remember.

Karl Diefenderfer captured this sundog on his way into work Thursday morning in Washington Crossing, Pennsylvania.

Eliot Herman in Tucson has an automatic camera set-up that catches many meteors. He caught this one Wednesday morning.

While you're watching for meteors Friday and Saturday mornings, watch for Venus, too. It's very bright and ascending in the east at dawn. Photo by Steve Scanlon Photography.