I just came across this very ironic photo in a CNN News article of a 1909 Lincoln Penny which is covered in Mars dust. The picture was taken by the Mars Curiosity Rover.
I find the "In God We Trust" phrase ironic considering God had nothing to do with it. It is the ingenuity and engineering brilliance of the men and women of NASA's space program that got it there!
No superstition needed, just science.
You can see the source document and many other cool pictures here:
(It's the eleventh picture in the series)