Planetary scientists hope the seven instruments NASA has competitively selected for its planned Mars 2020 rover will find evidence that life has existed on the red planet and maybe that it still does. In addition to providing a contextual step up from  the “bulk” composition data that Curiosity’s internal chemistry lab obtains from surface samples, the new rover is planned to be able to drill into rocks as far as 10 cm for pristine material, including organics ...

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