#dust.material  free microscopic particles of solid material; "astronomers say that the empty space between planets actually contains measurable amounts of dust"
  supertype:  #material.substance__stuff  the tangible substance that goes into the makeup of a physical object; "coal is a hard black material"; "wheat is the stuff they use to make bread"
  subtype:  #interplanetary_dust  microscopic particles in the interplanetary medium

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