Clickworkers logo Mars Clickworkers Your task:
Mark all craters
(training -- click here to do a real one)
This image is one of tens of thousands of images that we are asking volunteers to examine and identify craters in.

Pick a crater and click at a point on its rim.

Your task, should you choose to accept it: Click on four points around the rim of each crater. You may ignore craters that are smaller than this: image showing size of smallest crater to mark

NASAAmes Research Center Clickworkers pilot study
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