K2-229 b orbits a Sun-like G-type star 335 light-years distant, measuring 1.2 × Earth in radius with exceptional density hinting at iron dominance. Its ultra-short 0.86-day orbit exposes it to intense heat, stripping potential atmospheres. As a Mercury analog but denser, it provides clues to core-exposed worlds. It endures in the Galactic Codex as a testament to planetary evolution under stellar extremes, broadening our understanding of diverse terrestrial compositions.
