TRAPPIST-1 g is the farthest of seven Earth-sized planets around an ultra-cool red dwarf M-type star 40 light-years away. Measuring 1.1 × Earth in radius, it orbits every 12.4 days at 0.046 AU on the habitable zone’s outer edge. Possible volatile-rich composition hints at icy surfaces or subsurface oceans, with resonant dynamics aiding stability. As a key member of this iconic system, it stands eternally in the Galactic Codex, illustrating the potential for temperate worlds in tight-knit stellar families and inspiring visions of life in unexpected cosmic corners.
