sep 152012
 
Mystery Spheres on Mars (With Video)

  NASA’s long-lived rover Opportunity has returned an image of the Martian surface that is puzzling researchers. Spherical objects concentrated at an outcrop called Kirkwood on the western rim of Endeavour Crater differ in several ways from iron-rich spherules nicknamed “blueberries” the rover found at its landing site in early 2004. Using its Microscopic Imager, Opportunity [continue reading]