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abstraction > belief > outdated belief > nebular hypothesis |
nebular hypothesis | ||||
subject | fact |
nebular hypothesis | see also island universe hypothesis | |
has definition Hypothesis, maintained in the nineteenth and early twentieth century, that the spiral nebulae are not galaxies but are instead whirlpools of gas from which new systems of stars and planets are condensing. Compare island universe theory. | ||
is a kind of outdated belief |