This idea was developed into density wave theory by C . C . Lin and Frank Shu in 1964.
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For example, density wave theory explains one such formalization . talk ) 22 : 17, 10 April 2011 ( UTC)
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A "'spiral galaxy "'is a type of galaxy characterized by a central spirals arms due to density wave theory.
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Density wave theory is only a part of the set of theoretical explanations there are about galactic spirals; see Spiral galaxy # Origin of the spiral structure.
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More specifically, the density wave theory argues that the " gravitational attraction between stars at different radii " prevents the so-called winding problem, and actually maintains the spiral pattern.
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*Let me give a pointer to density wave theory ( already mentioned by Wrongfilter ), which contains some animations that may be useful for getting an intuition for the process . talk ) 17 : 34, 19 July 2012 ( UTC)
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