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newtonian
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This is a question mentioned on the Science channel broadcast, to begin in about 15 minutes, entitled "Cosmic Odyssey," episode "Extreme Astronomy," (2002).<br /><br />Compare the lyman-alpha forest of spectral lines in Quasar spectra caused by (apparently) absorption by hot intergalactic (IGM) gas clouds (ionized).<br /><br />See a Scientific American article on the latter - very interesting as is the broadcast!