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this within fourteen years, 1662-1675.
Meanwhile gravitation in general terms
was being discussed by Hooke, Wren, Hal-
ley, and many others. All of these men
felt a repugnance to accept the idea of a
force acting across the empty void of space.
Descartes (1596-1650) proposed an ethereal
medium whirling round the sun with the
planets, and having local whirls revolving
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