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The earlier object was spotted from this photo which showed the ground where Curiosity's second scoop of soil was taken. The object is hard to find but it's in the clump of dirt near the top right of the photo.
This may remind you of a character from South Park but it actually shows the 3-inch particle tray used to help filter the samples for testing.
The first sample of soil "about as big as a baby aspirin" according to NASA is now being analyzed.
As the Mars rover Curiosity prepared to take its first soil sample, scientists scoured the photos it took and discovered a shiny object laying on top of the planet's surface. Upon further study NASA scientists believe that it's something that fell off Curiosity, such as a piece of plastic.