NASA Mars rover Opportunity reveals geological mystery: Spherical objects unlike previously found 'blueberries'
Friday, September 14, 2012 - 15:00
in Astronomy & Space
NASA's long-lived rover Opportunity has returned an image of the Martian surface that is puzzling researchers. Spherical objects concentrated at an outcrop Opportunity reached last week differ in several ways from iron-rich spherules nicknamed "blueberries" the rover found at its landing site in early 2004 and at many other locations to date.