Two forces affect the planetary nebula. Those forces are electromagnetic forces of the giant plasma cloud. The shine of those particles is electromagnetic radiation that pushes particles away from each other. The electromagnetic interaction affects two directions. It can push, and it can pull objects.
Another force is gravitation. That pulls particles together. The symmetry of those forces. Or repelling and pulling effects determines if there is a possibility that some kind of stars or planet form in those nebulas.
The electromagnetic force between ions or monopolar particles that have the same polarity pushes those particles away from each other. the electromagnetic force between anions and ions is pulling particles together along with gravitation.
When we look at the Helix nebula above this text, we see the shine. Image one is taken by using visible light. And the second one is in the infrared wavelength. That is the emission radiation of ions and anions. The supernova remnant in the middle of the nebula adjusts the atoms to a higher energy level. The shine comes from atoms that are adjusted from a higher energy level. That shine causes the repel of those ions if they are all ions. The electromagnetic emission radiation pushes particles away from each other and denies the form of stars. So there must form some center in the nebula, before the formation of stars begins.
The center can be electromagnetic. In that case, the anion can slip into the ion plasma. And start to grow material around it. Or some other thing causes the disturbance that starts the formation of stars. That center must have so powerful pulling force, that it will win the electromagnetic repelling force of the particles. That have the same polarity.
Helix Nebula in the infrared image.
When a rogue planet wanders into a galaxy. And when it faces the planetary nebulas that planet is creating a disturbance when it pulls that material to it. The movement trajectory of that material is similar to neutron stars or black holes. But the effect is weaker.
That thing causes the whirls and impacts in that nebula. And impacted particles are forming the gravitational centers.
Those gravitational centers are making the material pile up at those points. So the gravitational effect of exoplanets is making it possible that the stars and planetary systems to start forming.
Mainly the term "Planetary nebula" means nebulas where lots of heavy elements. or their origin in exploded stars. Every heavier-than-hydrogen element in the universe formed in the fusion reaction in the stars. Without those elements, forming of planets is not possible.
https://scitechdaily.com/rogue-planets-captured-by-stars/
https://en.wikipedia.org/wiki/Planetary_nebula
https://astronomyandtechnology.blogspot.com/
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