The nebula itself is not twisting; however, there is what's called a binary star system in the middle, which is what gives it the "butterfly wings". One star is dying and has shed the outer layers, so it is just the core of the star, which gives us that incredible light show.
The binary star system in the middle with the dying star and white dwarf star continues to orbit each other, though. The jets are actually still growing due to that.
Theres a binary star system in the middle. One is dying and has shed its outer layers. The two stars orbiting around a common center of mass caused the gas from the dying star to split into the two lobes. They are still expanding to this day. (Sorry, some people act like knowitalls)
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