The Canyon's Age Sparks Fierce Scientific Debate Scientists have spent over a century arguing about when the Colorado River first carved through the Colorado Plateau. A diverse set of geologic studies ...

Hike through secret slot canyons, spot endangered California condors, visit sacred Navajo sites, and kayak a stunning 10-mile ...

About 3.8 billion years ago, two massive canyons likely formed on the moon in a span of less than 10 minutes, according to new research. The extraordinary formations, each comparable in size to ...