The entirity of Homestuck revolves around 5 session (BETA Trolls, ALPHA Trolls, BETA Humans, ALPHA Humans, Cherubs), and like all sessions, they inavitate in PARADOX SPACE, the thing is that all 5 session go like asolar system to the green sun,but why does that sun exists? well, there is the lore reason (the tumor containing both the Trolls universe and the Kids one ) but there is also THE LORE reason:
Quoted from page https://www.homestuck.com/story/4702:
ROSE: Biologically speaking, it's to be expected that null sessions far outnumber the successful ones. When it comes to reproductive systems, overwhelming redundancy is commonplace.
ROSE: A universe has a reproductive system that spreads many seeds, as it were, most of which never come to fruition. So we shouldn't feel too bad about our results, really. It was quite par for the course.
ROSE: But then, it would also seem that exceedingly few null sessions result in the birth of a massive green star fueled by two dead universes. For what it's worth.
that "green star" is the Green sun (obv) and is the reason all sessions, skaias, and horrorterros can work togheter to do the paradoxes in homestuck and other things, also being the way all the Session seeds are tracked.
this still makes more question, like: Can other session out of the orginal ones join the Green sun orbit? how many green suns existe in paradox space? can Horrorterros harm the Green sun in any way?
those question will never be answered!
Btw, go to my Spacehey https://blog.spacehey.com/entry?id=1204234