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In April Nasa crashed its Messenger probe into Mercury once it was done mapping the planet.
Other missions on the drawing board include these: *In 2005, a Mars Reconnaissance Orbiter, modeled on the successful Mars Global Surveyor, still orbiting and mapping the planet.
Besides watching the weather, they are a cheap and accurate way of mapping the planet's surface.
The spacecraft's camera system, designed for mapping the planet's surface mineralogy and looking for more clues to its complex geologic history, is taking pictures in visible and infrared light.
The suite includes spectrometers to study the composition of the surface and the thin atmosphere, and a novel color camera for mapping the planet in 3D at 10-meter resolution.
The probe has been in orbit around Mercury since March 2011, and its team announced Feb. 28 that the spacecraft had finished mapping the planet's surface.
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Efforts to re-establish contact with the spacecraft, which has mapped the planet since 1996, have failed and scientists fear the probe has finally failed.
Actually, with over 2 million drivers helping them map the planet, and over 250 million kilometers logged, they're already really big.
In the 1880s, Giovanni Schiaparelli mapped the planet more accurately, and suggested that Mercury's rotational period was 88 days, the same as its orbital period due to tidal locking.
The question cartographers are always being asked at cocktail parties, says Heyman, is whether there's really any mapmaking still left to do: we've mapped the whole planet already, haven't we?
By the time humanity got its first closeup view of Mars, a little less than a century after Schiaparelli mapped it, the planet had come to seem like a second, more exotic Earth.
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