From the object's motion, scientists do not think it was the Russian probes Mars 2, Mars 3, Mars 5, or Phobos 2; or the American probes Mariner 9 or Viking 1.
That leaves Viking 2, which has a polar orbit that would fit with the north-south orientation of the streak.
In addition, only Viking 1 and 2 are in orbits that could produce the type of motion as fast as that seen by Spirit.
Source: BBC: Read more.....
Now, I think that's interesting....
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