F. Hecht 
IXth International Astronautical Congress/IX. Internationaler Astronautischer Kongress/IXe Congrès International D»Astronautique [PDF ebook] 
Amsterdam 1958. Band 1

Did the Universe have a beginning? Will it have an end? Or has it always been the same, never changing? This is the subject of cosmology; the study of the Universe, and this book provides a perfect i …

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