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Mission to Mercury Is the Stuff of Mystery

Posted: 8/2/2004 12:00:00 AM   Reads: 163   Submitted By:clayroy   Category: Space   Source: www.washingtonpost.com
Why is Mercury basically a gigantic iron ball? Why does it have a magnetic field? Why does it have a cloud of sodium gas surrounding it? Is the shiny stuff that fills the polar craters ice, and if so, where did it come from?
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