On December 4th, 1997, NASA launched Pathfinder, an unmanned mission to Mars which arrived seven months later on July 4th, 1997. The rover it carried, Sojourner, explored the red planet for a total of eighty days afterwards.

On December 4th, 1997, NASA launched Pathfinder, an unmanned mission to Mars which arrived seven months later on July 4th, 1997. The rover it carried, Sojourner, explored the red planet for a total of eighty days afterwards.

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