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Originally Posted by parallaxicality
How much will this add to the map?
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A lot. I haven't seen, like, a percent-increase comparison.
NASA MESSENGER Mission: NASA Spacecraft to Make Historic Flyby of Mercury
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"During this flyby we will begin to image the hemisphere that has never been seen by a spacecraft and Mercury at resolutions better than those acquired by Mariner 10," said Sean C. Solomon, MESSENGER principal investigator, Carnegie Institution of Washington. "Images will be in a number of different color filters so that we can start to get an idea of the composition of the surface."
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I think I read that the three flybys will finish with most of Mercury mapped -- and then, of course, when orbit is achieved then it starts being really covered.