The Great Nebula in Orion" Professor Ball says: "... And in this, as in many nebula, we find black holes with edges surprisingly sharp which are very hard to explain, except upon the highly speculative assumption that they represent dark material structures... A Journey to the Earth's Interior: Or, Have the Poles Really Been Discovered - Página 46 por Marshall Blutcher Gardner - 1920 - 456 páginas Vista completa -
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