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Microscopic Imager Non-linearized Full frame EDR acquired on Sol 125 of Opportunity's mission to Meridiani Planum at approximately at approximately 13:26:21 Mars local solar time, Microscopic Imager dust cover commanded to be OPEN. NASA/JPL/Cornell/USGS
Originally posted by SavedOne
It's a microscopic photo. The field of view is 31mm square (source), so the entire image is about 1-1/4" across. Conclusion: not leaves or blades of grass.