A high-resolution camera mounted on NASA's Mars Reconnaissance Orbiter has snapped pictures of unusual, almost perfectly circular sand dunes on the Red Planet's surface. When you purchase through ...

Scroll through the following undated pictures to see vintage images of vacationers enjoying the warm sun as they cruise across the rolling and ever-shifting West Michigan sand dunes. Don't Edit ...

The sand dunes were imaged as part of a program to ... It comes as part of a series of pictures taken by the HiRise camera that orbits Mars on the Mars Reconnaissance Orbiter (MRO) spacecraft.

Black and white photos of nattily dressed men and improbable-looking flying machines against a background of sand dunes instantly evoke the Wright Brothers’ pioneering flights at Kitty Hawk.