planetary_rings.csv
Data taken from:
Saturn:
http://lasp.colorado.edu/~espoclass/ASTR_5835_Fall-2017-Review%20Chapters-Saturn/17-Origin%20and%20Evolution%20of%20Saturn%27s%20Ring%20System.pdf
Jupiter:
https://en.wikipedia.org/wiki/Rings_of_Jupiter
Uranus:
https://en.wikipedia.org/wiki/Rings_of_Uranus
Neptune:
https://en.wikipedia.org/wiki/Rings_of_Neptune

min - inner radius km
max - outer radius (where there is none this is the center radius) km
od is optical depth
df is dust fraction %

ring_name_simp is so you don't have to type Greek letters
