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The Viking Landers also each had radioisotope thermoelectric generators, (back in 1976) and operated on Mars for four and six years respectively. The solar-powered 1997 Mars Pathfinder mission's 'Sojourner' rover used radioisotope heaters to keep its electronics box warm. The solar-powered Mars Exploration Rovers Spirit and Opportunity also use radioisotope heaters.
The MMRTG on MSL/Curiosity will give it an operating lifespan on Mars' surface of a full Martian year (687 Earth days, a little less than two Earth years) and will allow it to operate over a wide range of latitudes, (just in case they change the landing site for some reason). The MMRTG delivers about 2 KW thermal power (to keep things warm), and 120 Watts electrical power (for the electronics). It weighs about 43Kg.
Cheers
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