Generatorites

Generatorites are a hypothetical class of exoplanets believed to form in the outer regions of protoplanetary disks. Their defining characteristic is their presumed composition, which would be rich in the volatile elements that condense at low temperatures, such as water, methane, and ammonia. Unlike terrestrial planets which form closer to the star and are primarily composed of rock and metal, generatorites would have a substantial icy mantle and potentially a thick atmosphere.

The theory behind generatorites suggests they would originate from regions beyond the "snow line" in a protoplanetary disk, where temperatures are low enough for volatile compounds to freeze and accrete into planetesimals. These planetesimals would then grow through gravitational interactions, eventually forming larger bodies. The term "generatorite" implies that these planets could be significant sources of volatile materials, potentially supplying water and other key elements to inner planets through later migration or impacts.

While no definitive generatorite has been confirmed, their existence is inferred from models of planet formation and observations of planetary systems. Such planets are thought to be common, particularly in the outer solar systems of other stars, and could represent a significant population of exoplanets. Their potential for hosting liquid water beneath their icy shells also makes them intriguing targets in the search for extraterrestrial life. Further observations and theoretical advancements are needed to confirm their existence and understand their diversity.