This high-resolution image captured by the Mars Exploration Rover Opportunity's panoramic camera highlights the puzzling rock outcropping that scientists eagerly wait to investigate. These layered rocks measure only 10 centimeters (4 inches) tall and are thought to be either volcanic ash deposits or sediments carried by water or wind.

NASA's Mars Exploration Rover Spirit took and returned this image on January 28, 2004, the first picture from Spirit since problems with communications began a week earlier. The image from the rover's front hazard identification camera shows the robotic arm extended to the rock called Adirondack.	This image shows the Mars Exploration Rover Opportunity's wheels in their stowed configuration. As of 9:00 a.m. January 28, 2004, the rover had deployed its wheels and completed the first half of the stand-up process. This image was taken at Opportunity's landing site, Meridiani Planum, by the hazard-identification camera.
These high-resolution images captured by the Mars Exploration Rover Opportunity's panoramic camera show in superb detail a portion of the puzzling rock outcropping that scientists are eagerly planning to investigate. Presently, Opportunity is on its lander facing northeast; the outcropping lies to the northwest. These layered rocks measure only 10 centimeters (4 inches) tall and are thought to be either volcanic ash deposits or sediments carried by water or wind.                                -Source: NASA