We’ve just seen the coinage of a new word that denotes an entirely novel category of planets. Out of research at the University of Cambridge comes a paper on a subset of habitable worlds the scientists have dubbed ‘Hycean’ planets. These are hot, ocean-covered planets with habitable surface conditions under atmospheres rich in hydrogen. The…‘Hycean’ Worlds: A New Candidate for Biosignatures? — Centauri Dreams — Imagining and Planning Interstellar Exploration
Paul Gilster of Centauri Dreams writes not fiction, but analyses and discussions on the latest findings in deep space research. He unabashedly is a proponent of efforts toward interstellar travel, frequently writing about the reasons we should invest in such a future. In this piece, he discusses a new category of exoplanets, Hycean worlds, worlds which may have water surfaces under hydrogen atmospheres, and which could potentially support life under a wider range of stellar and planetary conditions than Earth-like worlds.
Within my own fictional imaginings, we have the Orta, a seemingly water-breathing species, though we don’t yet know where they come from. Perhaps their home planet is a Hycean world like those described here?