Warming seawater might be the culprit, or seals might have gnawed the holes. For now, the strange circular holes in Arctic sea ice, photographed earlier this month, are mysterious.
Shell Beach is a neighborhood in the city of Pismo Beach in San Luis Obispo County, California. Photographer Mimi Ditchie caught this image on Earth Day weekend.
Enjoy this interesting and unique photo of star trails, showing the whereabouts of the celestial equator and the arc of stars around both celestial poles.
A popular hike in Big Bend National Park in Texas will take you to what's called "the Window.” It's a grand place to watch the sun or moon set. Here's a night shot, complete with zodiacal light.