curiosity rover and rainbow dash (friendship is magic and etc) created by parclytaxel
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Description

96, Curium

Alpha particle X-ray spectrometers, as carried on the Curiosity rover, typically use 244Cm as the alpha source. Those alphas scatter off the rock in a precise way, allowing the elemental composition to be determined.

The particular rock here is Rocknest 3, which really was visited by Curiosity.

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