The research team modeled how this would have played out, explaining that the ring would have likely collided with the moon's surface at a very low angle. Since the falling rings would have been ...

Last week I presented the first in a two-part primer of Tucson's fascinating and numerous mountain ranges. Here's the second part. Roughly 30 miles southwest of Tucson, just west of Green Valley and ...

I've looked at the mountains around Tucson for years in wonderment and awe, appreciating their beauty, but lately realized that I had some questions. How many mountain ranges are there? Where did they ...

There are many odd things about Iapetus, the icy moon of Saturn. One of its most striking features is the strange two-tone coloration of its surface, likely due to the evaporation of water ice leaving ...

Years ago, during a self-guided rafting expedition in Alaska, I found myself on a small island where four major valleys and two mighty rivers converged. Nestled on this island was a giant boulder ...