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Keywords: Voyage in Space page286.png en Illustration of an experiment in which a number of pendulums manage to swing roughly through the same centre with fewer collisions than might have been expected An analogy to stars in a cluster or stream moving under gravitational forces The children have been represented as zodiacal constellations A Voyage in Spacehttps //archive org/details/voyageinspacecou00turnrich Herbert Hall Turner 1913 1930 A Voyage in Space Pendulums |