"Rogue" Neptunes Are Detached But Not Alone

Scientists have discovered that Neptune-sized "rogue" planets, which drift through the galaxy without orbiting a star, might still have a companion. These worlds are detached from their parent stars but may not be entirely alone in the vastness of space. This finding suggests that these planets could have formed in a stellar system and were later ejected, possibly carrying a moon or another planet along for the ride. Understanding these rogue planets helps us grasp the dynamics of planetary formation and the possible variety of celestial bodies in the universe.