Astrophysics (Index)About

protoplanet

(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 protoplanet is also more-specifically used for objects that are more planet-like for showing planetary differentiation, i.e., having developed internal layers, implying stratification of a melted interior at some point in their history. Some asteroids, such as Ceres, Pallas, and Vesta fit the description.

However, the above usages are not universal: the term protoplanet is also sometimes used for any object representing a stage in the formation of a single planet, or for some other particular stage.


(planet type,object type,planet formation,planets)
Further reading:
https://en.wikipedia.org/wiki/Protoplanet
https://dictionary.obspm.fr/index.php?formSearchTextfield=protoplanet&showAll=1
https://www.britannica.com/science/protoplanet

Referenced by pages:
Bondi radius
disk gap
dynamical friction
PDS 70
planet type
Psyche

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