(left): Meridian Planum, Mars, scale about 50m (NASA Opportunity Rover); (right): Rock, dry river bed, Sunset Crater NP, AZ, scale about 200m (Stephen Strom)
(left): Meridian Planum, Mars, scale about 50m (NASA Opportunity Rover); (right): Rock, dry river bed, Sunset Crater NP, AZ, scale about 200m (Stephen Strom) ,
©
© Stephen Strom,
Image courtesy Stephen Strom