interplanetary medium

interplanetary medium

noun
interplanetary space including forms of energy and gas and dust 
WordNet® 3.0, © 2006 by Princeton University.
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Encyclopedia Britannica
Encyclopedia

interplanetary medium

thinly scattered matter that exists between the planets and other bodies of the solar system, as well as the forces (e.g., magnetic and electric) that pervade this region of space. The material components of the interplanetary medium consist of neutral hydrogen, plasma gas comprising electrically charged particles from the Sun, cosmic rays, and dust particles

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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