In the years between 1900 and 1931 astronomers witnessed three
startling changes in their view of the Universe. First, the
accepted value of the size of the star system, which increased by a
factor of ten; secondly, evidence forced the acceptance of the fact
that there are other star systems beyond our own Galaxy; and
lastly, that observation of these external galaxies disclosed the
expansion of the Universe. This book, originally published in 1982,
describes and explains in detail these shifts in opinion,
considering them in the light of theories and ideas on the nature
of the Universe, were current at the beginning of the twentieth
century. Archive material is used to provide major interpretations
of several of the processes and events associated with these shifts
such as the 'Great Debate' between Harlow Shapley and H. D. Curtis
in 1920 on 'The scale of the Universe'. This book with be of
interest to professional and amateur astronomers as well as
historians of science.
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