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Timeline of knowledge about the interstellar and intergalactic medium

   * 1848 - Lord Rosse studies M1 and names it the Crab Nebula
   * 1864 - William Huggins studies the spectrum of the Orion Nebula and
     shows that it is a cloud of gas
   * 1927 - Ira Bowen explains unidentified spectral lines from space as
     forbidden transition lines
   * 1930 - Robert Trumpler discovers absorption by interstellar dust by
     comparing the angular sizes and brightnesses of globular clusters
   * 1944 - Hendrik van de Hulst predicts the 21 cm hyperfine line of
     neutral interstellar hydrogen
   * 1951 - H.I. Ewen and Edward Purcell observe the 21 cm hyperfine line of
     neutral interstellar hydrogen
   * 1956 - Lyman Spitzer predicts coronal gas around the Milky Way
   * 1965 - James Gunn and Bruce Peterson use observations of the relatively
     low absorption of the blue component of the Lyman-alpha line from 3C9
     to strongly constrain the density and ionization state of the
     intergalactic medium
   * 1969 - Lewis Snyder, David Buhl, Ben Zuckerman, and Patrick Palmer find
     interstellar formaldehyde
   * 1970 - Arno Penzias and Robert Wilson find interstellar carbon monoxide
   * 1970 - George Carruthers observes molecular hydrogen in space
   * 1977 - Christopher McKee and Jeremiah Ostriker propose a three
     component theory of the interstellar medium
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