Is inherently incomplete. Not necessarily because they're needed to explain it, but they do need to be brought up at any time possible because they're cool.
I feel that way about galactic center filaments. They just scream "this region of space is not safe" in the most awe-inspiring way to me. 150-lightyear-long, magnetically powered, speed-of-light tornados. And there's hundreds of them.
These are cool. I wonder how much they screw with satellites etc.? How predictable are they? It seems like it's just a deadly, mostly-invisible wall of energy flying around at unbelievable speeds!
Is inherently incomplete. Not necessarily because they're needed to explain it, but they do need to be brought up at any time possible because they're cool.