Word: spiralling
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Dates: during 1930-1939
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Professor Lundmark in his paper told of his exploration among the spiral nebulae which are at a distance of 500,000 to 150,000,000 light years from the earth. Although these nepulae are smaller in themselves by much than our own galactic system, nevertheless they seem to come in groups of thousands or so, and Lundmark has advanced the important theory that each group of these comprises a separate system such as ours...