* "Wandering" is a subjective term: What counts as "wandering" depends on your definition. Does it mean a planet ejected from its original system? A planet with a highly eccentric orbit? A planet that migrated to a different location within its system?
* We haven't observed most planets: We've directly imaged only a handful of planets outside our solar system. The vast majority are detected indirectly, through their gravitational influence on their stars.
* Planet formation is complex: Planetary systems are dynamic, and planets can be ejected, captured, or migrate during formation. There's no single "wandering" process.
However, we do have some insights:
* Ejected planets: Some studies suggest that a significant fraction of planets formed around stars are ejected from their systems early on. This is thought to be due to gravitational interactions with other planets during formation.
* Rogue planets: There's evidence for free-floating planets (sometimes called rogue planets) wandering the galaxy without a host star. The exact number of these is still unknown, but they likely exist in significant numbers.
In summary: We don't have an exact count of "wandering" planets. It's an active area of research, and we're continuously learning more about the dynamics of planet formation and evolution.
