Launch of the Mariner 4 mission to Mars

Launch of the Mariner 4 mission to Mars


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Mariner 4 launch. Atlas-Agena D rocket lifts off carrying Mariner 4, the first spacecraft to produce close-range images of the planet Mars. Mariner 4 was launched on 28 November 1964. After 228 days and 523 million kilometres (km) it passed Mars at a distance of 9844 km on 14 July 1965. Twenty-one full images, covering about 1% of the surface of Mars, showing that it was heavily cratered and very dry. Mariner 4 also discovered that Mars had no radiation belts or magnetic field, indicating that the planet did not have a metallic core. It also found that the carbon dioxide atmosphere was very thin. The Atlas-Agena D rocket was a development of a military missile.

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