In the vast archive of the cosmos, GJ 3378 b stands as a steadfast super-Earth, a world of solid promise circling its red dwarf host in the conservative habitable zone. With mass and radius measurements aligning closely with a rocky composition, it represents the kind of terrestrial body that populates the grand ledger of potentially life-bearing planets. Its temperate equilibrium temperature invites liquid water if an atmosphere can persist, even as it straddles the cosmic shoreline where M-dwarf worlds may keep or lose their air. With a radius of 1.3 × Earth and a mass near 2.3 Earths, it orbits an M-type star 25 light-years away every 21.5 days at 0.097 AU, receiving about 90 percent of the sunlight Earth enjoys. This nearby habitable-zone world stands eternally in the Galactic Codex as a neighbor worth watching for future atmospheric study.
