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A plasma is a state of matter where the material has all become ionised. The ionised material is radio opaque in much the same way that water or earth is, only more so. The electrically charged plasma ions interfer with radio waves extremely effectively. Think of the the problems with radio reception in the far north during a strong aurora, caused by the flow of charged (ionised) particles from the sun streaming into the magnetic poles. The ionisation field around a re-entering space ship is orders of magnitude worse.
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The secret to great marksmanship is deciding what the target was AFTER you've shot.
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