Ripples of blue sand seem to flow along the bottom of Santa Maria crater in a new false-color picture taken by the Mars rover Opportunity. The colors—based on the wavelengths of near-infrared and visible light captured by the rover's camera—help show the differences in soil and rock compositions around the crater.
The picture was taken to mark Opportunity's seventh year exploring the face of the red planet. The rover landed on Mars on January 24, 2004, for a mission that was supposed to last just three months. Opportunity will spend a few weeks taking data on Santa Maria before resuming its primary trek toward the much larger Endeavour crater.
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