This is neat! I love that your Step 15 shows an accurate version of the 3d helix, rather than the highly-viral "vortex" animation from a few years back[0]

It'd be awesome to scale this up to the Milk Way, and beyond, watching everything move in relation to larger time scales.

[0]https://astrorhysy.blogspot.com/2015/03/and-yet-it-moves-qui...