#extraterrestrial_object__estraterrestrial_body  a natural object existing outside the earth and outside the earth's atmosphere
  supertype:  #natural_object__naturalobject  an object occurring naturally; not made by man
  part of:  #existence
  subtype:  #comet  (astronomy) a relatively small extraterrestrial body consisting of a frozen mass that travels around the sun in a highly elliptical orbit
  subtype:  #meteoroid  (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere
     subtype:  #meteorite  stony or metallic object that is the remains of a meteoroid that has reached the earth's surface
        subtype:  #aerolite  a stony meteorite consisting of silicate minerals
        subtype:  #micrometeorite  a meteorite so small that it drifts down to earth without becoming intensely heated in the atmosphere
        subtype:  #pallasite  a meteorite composed principally of olivine and metallic iron
        subtype:  #siderite  a meteorite consisting principally of nickel and iron
     subtype:  #meteor_swarm  a group of meteoroids with similar paths

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