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Text File  |  1995-11-04  |  266b  |  8 lines
  1. shock front: The well-defined edge
  2. formed when two bodies of gas with
  3. different densities and/or pressures
  4. interact. You can observe this
  5. phenomenon in some nebulae where
  6. the bright outer edge comes to an
  7. abrupt halt when it contacts the
  8. surrounding material.