
Language
en
Duration
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Publisher of text edition
Project Gutenberg
Original publisher
Chicago: Charles H. Kerr & Co., 1912.
Credits
Tim Lindell, Donald Cummings, and the Online Distributed Proofreading Team at https://www.pgdp.net (This file was produced from images generously made available by The Internet Archive/Canadian Libraries)
Release date
2023-11-11
Rights
Public domain in the USA.

1873–1960
A pioneering Dutch astronomer who also became one of the best-known Marxist thinkers of his time, he wrote with unusual range about both the stars and society. His life joined scientific work, political commitment, and a deep curiosity about how people understand the world.
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