3 of 10Image
grains of sand
Both rovers together have taken more than 130,000 pictures of Mars. This image of an area 1.2 inches across was taken by Spirit's microscopic imager. The scale can show features as small as 4 one-thousandths of an inch.
Opportunity, which is about the size of a golf cart, recently captured this false-color panoramic view of a wind-blown ripple called "Scylla."
These before and after images depict an encounter by Opportunity's rock abrasion tool with a rock target dubbed "Kalavrita." The circle is about 1.8 inches across.