A rogue planet is a planet that does not orbit any star, but instead wanders through interstellar space. Rogue planets are usually formed in one of two ways: either they were ejected from their original star system by gravitational interactions with other planets or stars, or they never became part of a star system in the first place and formed in isolation from a collapsing cloud of gas and dust.
It is possible that some rogue planets could have originally been part of our solar system, but were kicked out by the influence of Jupiter or Saturn, which are known to have migrated inwards and outwards over time. However, there is no direct evidence for this scenario, and it is more likely that most rogue planets in our galaxy originated from other star systems or regions of space.
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