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Timeline of knowledge about the interstellar and intergalactic medium : ウィキペディア英語版 | Timeline of knowledge about the interstellar and intergalactic medium
Timeline of knowledge about the interstellar medium 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 — Harold 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 * 1990 — Foreground "contamination" data from the COBE spacecraft provides the first all-sky map of the ISM in microwave bands. ==References==
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