Challenges of Getting to Mars – NASA’s Mars Exploration
Aug 31, 2001 · Thirty missions to Mars have been mounted by the space agencies of the U.S., Japan, and the former Soviet Union. Of the U.S. missions, 10 out of 15, or two-thirds, have succeeded. Only one of 16 Soviet missions succeeded, and the lone Japanese spacecraft is currently delayed in arrival at Mars due to propulsion problems.
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