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Internet search giant Google Inc. has been busy with more enhancements to its online maps. In March, Google launched Google Mars, a browser-based mapping tool that gives users an up-close, interactive view of the Red Planet with the click of a mouse. The Martian maps were made from images taken by NASA's orbiting Mars Odyssey and Mars Global Surveyor. Users can see the planet in three different formats: The Martian elevation map is color-coded by altitude; the visible-imagery map shows the surface in black-and-white pictures; and the infrared map indicates temperature, with...

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