NASA’s rover Opportunity has returned an image of the Martian surface that is puzzling researchers. Opportunity photographed these small spherical objects on September 6, 2012 using the Microscopic Imager. The view covers an area about 6 cm across on the western rim of Endeavour Crater (NASA / JPL-Caltech / Cornell University / USGS / Modesto Junior College) Small spherical objects concentrated at an outcrop called Kirkwood on the western rim...
