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Apparently, no information could pass through plasma, therefore during descent of spacecraft, no information can be transmitted. Why so?

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Plasma is "electrically neutral medium of unbound positive and negative particles". As it's got charge carriers floating about, it's electically conductive. In a sense, you can think of it as a metal sheet. If a metal sheet fully encloses the spacecraft, you'd get a Faraday Cage. Similarly, if the plasma sheath fully encloses the space craft, you end up with a Faraday Cage. Faraday Cages massively attenuate EM signals attempting to pass through them, resulting in loss of RF communications.

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