Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history. ...

The critical first billion years, during which life began, are blank pages in the earth's history. (Robert Jastrow)

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Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.

Robert Jastrow Quotes: The critical first billion years, during which life began, are blank pages in the earth's history.