Stephen Hawking about earth (“A Brief History of Time”, 1988) - The earth was initially very hot and without an atmosphere. In the course of time it cooled and acquired an atmosphere from the emission of gases from the rocks.
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The earth was initially very hot and without an atmosphere. In the course of time it cooled and acquired an atmosphere from the emission of gases from the rocks.
 Stephen HawkingA Brief History of Time (1988). copy citation

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