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Mars program
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===Mars 4NM and 5NM=== [[File:Mars 5NM.jpg|thumb|Mars 5NM]] The Mars 4NM and Mars 5NM projects would have seen heavier spacecraft launched by [[N1 (rocket)|N1]] rockets. They would have deployed heavy [[Marsokhod]] rovers onto the surface, and conducted [[sample return mission]]s. The N1 failed on all four of its test flights, and was never used to launch any Mars spacecraft.<ref name=mars45nm/>
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