Researchers may have an explanation for the natural near-perfect circles of stones that cover the ground in parts of Alaska and the Norwegian island of Spitsbergen. One of the real mysteries to me was ...

In remote regions of the Arctic, Antarctica, and the Australian outback, an explorer can trek across bleak, uninhabited landscapes only to suddenly stumble upon ground decorated with weird patterns.

Images taken by the Mars Global Surveyor, now orbiting the Red Planet, suggest that most areas with geological features known as patterned ground appear at high latitudes, the same regions where large ...