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A comment on Mass Extinction and the Structure of the Milky Way (2013). Parent comment

Re:Mass Extinction and the Structure of the Milky Way (2013) by Keysh on Monday May 08, 2017 @12:20PM (#14292980)
That's an exaggerated, simple model of spiral density waves; it's not a model for the Sun's orbit, which probably only varies in radius by about 10-15%.
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