http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. (PhysOrg.com) -- Spirit's right-front wheel, which had stopped operating in March 2006, revolved with apparently normal motion during the first three of four driving segments on Sol 2117 (Wednesday, Dec. 16) but stopped early in the fourth segment of the drive. http://www.physorg.com/news180369209.html Space & Earth Fri, 18 Dec 2009 14:33:51 EST news180369209 (PhysOrg.com) -- Diagnostic tests were run on Spirit's right-rear wheel and right-front wheel on Sol 2013 (Dec. 12, 2009). http://www.physorg.com/news180119338.html Space & Earth Tue, 15 Dec 2009 17:20:04 EST news180119338 (PhysOrg.com) -- Spirit's right-rear wheel stalled again on Sol 2099 (Nov. 28, 2009) during the first step of a two-step extrication maneuver. http://www.physorg.com/news178990566.html Space & Earth Wed, 02 Dec 2009 15:36:57 EST news178990566 (PhysOrg.com) -- On Sol 2095 (Tuesday, Nov. 24), Spirit performed a set of diagnostic actions related to a stall of the right-rear wheel on the previous drive, three days earlier. http://www.physorg.com/news178393606.html Space & Earth Wed, 25 Nov 2009 18:00:03 EST news178393606 (PhysOrg.com) -- Because the first extrication drive for Spirit, on Sol 2088 (Nov. 17), stopped as soon as it began due to an exceeded tilt limit, the plan for an extrication drive on Sol 2090 (Nov. 19) will essentially be a repeat of the first drive plan, but with improved rover attitude knowledge. The updated attitude knowledge comes from the rover's measurement of its tilt on Sol 2088. http://www.physorg.com/news177844519.html Space & Earth Thu, 19 Nov 2009 09:17:08 EST news177844519 (PhysOrg.com) -- Composition measurements by NASA's Mars Exploration Rover Opportunity confirm that this rock on the Martian surface is an iron-nickel meteorite. http://www.physorg.com/news168801850.html Space & Earth Thu, 06 Aug 2009 18:24:44 EST news168801850 Engineers placed a rock underneath the test rover at NASA's Jet Propulsion Laboratory, Pasadena, Calif., on July 1, 2009, to more closely simulate Spirit's predicament on Mars. http://www.physorg.com/news165768550.html Space & Earth Thu, 02 Jul 2009 15:50:12 EST news165768550 (PhysOrg.com) -- From the location of NASA's Phoenix Mars Lander, above the Martian arctic circle, the sun does not set during the peak of the Martian summer. http://www.physorg.com/news139073545.html Space & Earth Wed, 27 Aug 2008 16:32:25 EST news139073545