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* Mariner 10 - USA Mercury/Venus Flyby - 526 kg - (November 3, 1973 - March 24, 1975) Mariner 10 was the first dual planet mission. It flew past Venus on February 5, 1974 for a gravity assist to the planet Mercury. Mariner 10 was the first spacecraft to have an imaging system. It flew past Mercury 3 times on March 29, 1974, September 21, 1974, and March 16, 1975. These three encounters produced over 10,000 pictures with 57% planet coverage. It recorded surface temperatures ranging from 187°C to -183°C on the day and night sides. A weak magnetic field was detected but it failed to detect an atmosphere. Mariner 10 is now in a solar orbit.

* MESSENGER - USA Mercury Orbiter - 3 August 2004 The Mercury Surface, Space Environment, Geochemistry and Ranging (MESSENGER) mission is designed to study the characteristics and environment of Mercury from orbit.

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http://www.solarviews.com/eng/craft2.htm#mercury

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