tjowens: "what term do some astronomers designate our cluster or firmament?""They call it the Universe" http://t.co/kDixjrfrjp Smith’s Astronomy 1850


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“what term do some astronomers designate our cluster or firmament?””They call it the Universe” Smith’s Astronomy 1850

Article source: http://twitter.com/tjowens/statuses/328910111085064193