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Dust from the paths of distant planets

Two pictures via
It looks like today penny (one cent), taped to the side of the rover Kyuriositi as a calibration target his chambers:





And the pennies appeared two years ago in the world in August 2011 before sending a rover to Mars:



Source:
Pictures
Ask Ethan # 4: The strange astronomical maps
Map Creator — relief map, the age of which 120 million years
Photo deep space
The most detailed geological map of Mars
10 planets to visit which is not recommended
16 cards in the world, which is not taught in school
Report of the exclusion zone:
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One of my working days
The mystery of the fourth planet
...
Ask Ethan # 4: The strange astronomical maps
...
Map Creator — relief map, the age of which 120 million years
...
Photo deep space
...
The most detailed geological map of Mars
...
10 planets to visit which is not recommended
...
16 cards in the world, which is not taught in school
...
Report of the exclusion zone:
...
10 weirdest things in the universe
...
One of my working days
...
The mystery of the fourth planet
 A typical day ..  Protesters boobs