Mention141286

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so:text Our own galaxy system is only one of a great many, and observations made from any of the others would show exactly the same thing: all systems are receding, not from any particular centre, but from each other: the whole system of galaxies is expanding. (en)
so:isPartOf https://en.wikiquote.org/wiki/Willem_de_Sitter
so:description Kosmos (1932) (en)
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