Gediz Vallis Ridge
The Mars Science Laboratory and its rover, Curiosity rover, ''Curiosity'', were launched from Earth on 26 November 2011. As of , , ''Curiosity'' has been in Gale Crater on the Mars, planet Mars for Sol (day on Mars), sols ( days, total days; ') since landing on 6 August 2012. ''(See Timeline of Mars Science Laboratory#Current status, Current status.)'' Prelaunch (2004–2011) In April 2004, the United States National Aeronautics and Space Administration (NASA) called for scientific experiments and instruments proposals for the Mars Science Laboratory and rover mission. Launch was proposed for September 2009. By 14 December 2004, eight proposals were selected, including instruments from Russia and Spain. Testing of components also began in late 2004, including Aerojet's monopropellant engine with the ability to throttle from 15 to 100 percent thrust with a fixed propellant inlet pressure. By November 2008 most hardware and software development was complete, and testing cont ...
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