> Scientists theorize that a meteor struck Mars eons ago, knocking
 > a rock into space which eventually found its way to Earth.
 > What if the rock had originated on Earth, a meteor struck Earth,
 > knocked the rock all the way to Mars, where another meteor then
 > struck Mars, knocking the same rock all the way back to Earth.
 > ...Seems just as feasible to me.
I believe that it was identified as a Mars rock by gases trapped
in the rock during it's actual formation.
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