Astrophysics (Index)About


(simplest, least-developed object classified as a planet)

The term protoplanet, a term used in planet formation discussions, naturally refers to the "earliest" objects in a system that can be classified as planets. (The definition of planet varies: sometimes based on its structure and sometimes based upon its effect on the system, e.g., having the ability to protect a "lane" around its orbit.)

The term is more specifically used for objects that are more planet-like for having developed some internal layers through melting. Some asteroids, such as Ceres, Pallas, and Vesta fit the description.

(planet type,object type,planet formation,planets)
Further reading:

Referenced by pages:
Bondi radius
PDS 70
planet type