Mosaic image of the spherules in the rock outcrop on Cape York at Endeavour crater. Credit: NASA / JPL-Caltech / Stuart Atkinson One of the most interesting discoveries made so far by the Opportunity rover on Mars has been the small round spherules or “blueberries” as they are commonly referred to, covering the ground at … Continue reading "Opportunity Rover Finds Intriguing New Spherules at Cape York"