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| | The Mariner Missions to Mars |
 | | Mariner 6 and 7, both launched in 1969, completed the first successful dual mission to Mars (Mariner 5 was sent to Venus). |
 | | Mariner 6 and 7 were identical spacecraft sent to flyby Mars in order to collect data about the surface and atmosphere of Mars. |
 | | The Mariner missions also measured the moment of inertia of Mars, made the first determination of the Martian bulge now called Tharsis Ridge, and made a record of the surface dichotomy of old, elevated, northern terrain and young, low, southern terrain. |
| www.windows.ucar.edu /tour/link=/mars/exploring/mariner_overview.html (642 words) |
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