And passing through a local galaxy spiral arm... http://curious.astro.cornell.edu/physics/55-our-solar-system/the-sun/the-sun-in-the-milky-way/207-how-often-do

And passing through a local galaxy spiral arm... http://curious.astro.cornell.edu/physics/55-our-solar-system/the-sun/the-sun-in-the-milky-way/207-how-often-does-the-sun-pass-through-a-spiral-arm-in-the-milky-way-intermediate http://curious.astro.cornell.edu/physics/55-our-solar-system...