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Fritz Zwicky advanced astronomy over much of the twentieth century, pioneering findings on constituents of the cosmos from supernovae and neutron stars to dark matter and compact galaxies. He worked at two of the world’s most historically important observatories: Mount Wilson and Palomar in California. He was an early innovator in jet-engine design. Yet the Swiss astronomer is a somewhat elusive figure in the history of science. Science journalist John Johnson seeks to rectify that in his spirited biography, Zwicky.