interplanetary gas

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Noun1.interplanetary gas - a rarefied flow of gas and charged particles (plasma) that stream from the sun and form the solar wind
interplanetary medium - interplanetary space including forms of energy and gas and dust
solar wind - a stream of protons moving radially from the sun
plasma - (physical chemistry) a fourth state of matter distinct from solid or liquid or gas and present in stars and fusion reactors; a gas becomes a plasma when it is heated until the atoms lose all their electrons, leaving a highly electrified collection of nuclei and free electrons; "particles in space exist in the form of a plasma"
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The focus of Nozomi's international payload of instruments is how the solar wind and interplanetary gas affect the fringes of the Martian atmosphere.

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