Experimental conditions...
It's a bit tricky working at 94K, but people like Jeff Kargel are gradually cataloguing the physical properties of common solar system materials at these low temperatures. That's where the basic data comes from for us to understand Nitrogen geysers on Triton or whatever is happening on Titan.
Ralph Lorenz' book "lifting Titan's veil" is probably the definitive pre-Cassini text, speculating on surface conditions and processes, but we have already seen more from one close pass than was known before.
- We just don't understand what we've seen yet!