Protionaika
Protionaika is a hypothetical astronomical object, a type of planet or moon that is believed to possess a dense, iron-rich core and a relatively thin, volatile-rich mantle. The concept arises from theoretical models of planetary formation, particularly in scenarios where a celestial body forms closer to its star or undergoes significant impacts that strip away its outer layers.
The defining characteristic of a protionaika would be its high density, driven by a proportionally large iron
The existence of protionaika is not yet confirmed by direct observation. However, astronomers have identified exoplanets