Up until 2008, only one spacecraft had ever visited the planet Mercury, and it didn't linger long. NASA's Mariner 10 mission flew past the tiny world three times in the 1970s, giving humanity a helpful but limited glimpse of the solar system's innermost planet. Mariner 10 imaged about 45 percent of Mercury's surface and discovered its internal magnetic field, among other things.
Up until 2008, only one spacecraft had ever visited the planet Mercury, and it didn't linger long. NASA's Mariner 10 mission flew past the tiny world three times in the 1970s, giving humanity a helpful but limited glimpse of the solar system's innermost planet. Mariner 10 imaged about 45 percent of Mercury's surface and discovered its internal magnetic field, among other things.
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