Galaxy visualization example

LocalGalaxyVisualizer.ipynb

This is great @PBarmby! At @mwcraig's suggestion, here's a way to render the 3D plot as an interactable version using ipyvolume:

import ipyvolume

fig = ipyvolume.Figure(width=800, height=800)
scats = [ipyvolume.Scatter(x=x.value[early_mask], y=y.value[early_mask], z=z.value[early_mask], 
                           color='red', geo='sphere', size=-Kabs/50),
         ipyvolume.Scatter(x=x.value[~early_mask], y=y.value[~early_mask], z=z.value[~early_mask], 
                           color='blue', geo='sphere', size=-Kabs/50)]
fig.scatters = scats

fig.xlim = fig.ylim = fig.zlim = (-10, 10)
fig

(not the fig at the end is important: without that it never appears in the notebook)