Timeline of knowledge about the interstellar and intergalactic medium

Template:Short description Template:More citations needed Timeline of knowledge about the interstellar medium and intergalactic medium:

  • 1848 — Lord Rosse studies M1 and names it the Crab Nebula. The telescope is much larger than the small refactors typical of this period and it also reveals the spiral nature of M51.
  • 1864 — William Huggins studies the spectrum of the Orion Nebula and shows that it is a cloud of gas
  • 1904 — Interstellar calcium detected on spectrograph at Potsdam<ref name=":5">Template:Cite book</ref>
  • 1909 — Slipher confirms Kapteyn's theory of interstellar gas<ref name=":0">{{#invoke:citation/CS1|citation

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