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abstraction > hypothesis > theory > astronomy theory > galaxy theory > explosive galaxy formation

explosive galaxy formation
subject			fact

explosive galaxy formation	has definition A theory of galaxy formation wherein the explosion of a large number of stars creates a giant shock wave that travels outward and compresses the surrounding gas. Galaxies form in the regions of high-density gas.
	is a kind of galaxy theory
galaxy theory	has domain extragalactic astronomy
theory	has validity correct or incorrect with caveats
	has author or reasearch group
	has date or a range of dates for which the theory was active