Clickworkers logo Mars Clickworkers Your task:
Mark all craters
Show me how
This image is one of tens of thousands of images that we are asking volunteers to examine and identify craters in.

Instructions: Please click on four points around the rim of each crater. When finished, see below.

Show the craters I’ve marked.

You can start clicking on the next crater — or the last one, if it’s wrong.

When you’re done:
Finished? I choose not to do this one.
I’ve marked some of the craters, but can’t finish.
I’ve marked every crater larger than this: tiny crater example
I don’t see any craters here (or none large enough to mark).

NASAAmes Research Center Clickworkers pilot study
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