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3 Aug 2004
NASA's Messenger probe launched from Cape Canaveral, Florida.
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5 May 2000
A conjunction of Sun, Mercury, Venus, Mars, Jupiter, Saturn, and the Moon occurred.
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29 Mar 1974
NASA's Mariner 10 became the first spacecraft to reach Mercury.
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7 Nov 1631
Using Johannes Kepler's predictions, French scientist Pierre Gassendi became the first person to witness Mercury's transit between the Earth and the Sun.
