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It's nuclear. You can read about it here: http://en.wikipedia.org/wiki/Curiosity_(rover)#Specification...

SAM (Sample Analysis at Mars) then uses this energy to heat the soil and analyze it. I recommend everyone to read about the SAM, it's a fascinating instrument. Arguably the most complicated instrument we've (humans) ever built.

(If you're curious about the SAM, read this article: http://www.planetary.org/blogs/emily-lakdawalla/2012/curiosi...)







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