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Interstellar Medium Learning pages
About ISM from history of observation to current status of u nderstanding.
http://www-ssg.sr.unh.edu/tof/Outreach/Interstellar/
Hubble's Planetary Nebula Gallery (PRC97-38b)
http://oposite.stsci.edu/pubinfo/pr/97/38/b-js.html
Emission Nebulae
Part of a site on plasma physics.
http://fusedweb.pppl.gov/CPEP/Chart_Pages/5.Plasmas/Nebula/E mission.html
