Timeline of knowledge about the interstellar and intergalactic medium
Timeline of 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 - 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
The shuttered carriage.html">carriage.html">carriage.html">carriage.html">carriage.html">carriage that Ranjoor Singh had suspected to
something to Ranjoor Singh in an undertone, but the German did not
together beside the road in the distance. The shuttered carriage
isn't he--recognized you. Now he is pointing you out to the colonel!
let the regiment go by. He knew what was passing through Kirby's
faith in each other. And he knew that there was danger ahead of him
honor. He would have given, like Kirby, a full year's pay for a hand-
they ran for the gloom of the big gate, leaving the driver of the
of the shuttered carriage flew open as they reached it, and Ranjoor
on the carriage step, watching Colonel Kirby; he watched him question
into the carriage, shutting the door.html">door behind him.
The carriage was off almost before the door.
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