PSO J318.5-22 is a free-floating planetary-mass object 80 light-years from Earth, with a radius of 16.8 × Earth and no orbiting star. Roaming interstellar space, it shines faintly from residual formation heat, with atmospheric temperatures around 500–1000 K decreasing outward. As a young, isolated world likely ejected from its birth system, it represents a class of rogue planets unbound by stellar gravity. This solitary wanderer anchors the Galactic Codex, evoking the vast, untethered possibilities of planetary existence beyond traditional systems and deepening our awe at the universe’s hidden orphans.
