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The graph below illustrates how much knowledge we have gained in the past few years about the surfaces of the moon, Mars and Mercury.
The vertical scale represents, coverage, and the horizontal scale represents , resolution. Mercury is
represented by only one curve, since prior to the Mariner 10 mission of
1974 no object smaller than about 800 kilometers could be resolved in photographs of its surface. For the purpose of comparison gray band indicates resolution
where any work of man would be detectable on the earth.
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