Back Protoplaneet Afrikaans Protoplaneta AN كوكب أولي Arabic Протопланета Bulgarian Protoplaneta Catalan Protoplaneta Czech Protoplanet Danish Protoplanet German Protoplaneta Spanish Protoplaneet Estonian
A protoplanet is a large planetary embryo that originated within a protoplanetary disk and has undergone internal melting to produce a differentiated interior. Protoplanets are thought to form out of kilometer-sized planetesimals that gravitationally perturb each other's orbits and collide, gradually coalescing into the dominant planets.