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|colspan="2" align="center"|<small>Date e persone fondamentali
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|align="right">|''1941''||[[Andrew McKellar]] segnala l'osservazione di una temperatura [[bolometro|bolometrica]] media di 2,3 K, basata sullo studio delle righe di assorbimento interstellare<ref>{{cite journal|last=McKellar|first=A.|title=Molecular Lines from the Lowest States of Diatomic Molecules Composed of Atoms Probably Present in Interstellar Space|journal=Publications of the Dominion Astrophysical Observatory (Victoria, BC)|year=1941|volume=7|pages=251–272|doi=}}</ref><ref name="dao7">
{{cite journal|last=McKellar|first=A.|title=Molecular Lines from the Lowest States of Diatomic Molecules Composed of Atoms Probably Present in Interstellar Space|journal=Publications of the Dominion Astrophysical Observatory (Victoria, BC)|year=1941|volume=7|pages=251–272|doi=}}</ref><ref>
{{cite book|last=Weinberg|first=S.|authorlink=Steven Weinberg|year=1972|title=Oxford Astronomy Encyclopedia|pages=514|publisher=[[John Wiley & Sons]]|isbn=0471925675}}</ref>.
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