Primary atmosphere
Atmosphere of a protoplanet
A primary atmosphere, often also called a primordial atmosphere or proto-atmosphere, is an atmosphere of a protoplanet that forms by accretion of gaseous matter from the protoplanetary disk. Gas giant planets such as Jupiter and Saturn have primary atmospheres. Primary atmospheres are very thick compared to secondary atmospheres like the one found on Earth. The primary atmosphere was lost on the terrestrial planets of the Solar System due to a combination of surface temperature, mass of the atoms and the escape velocity of the planet.
Formation and Composition
Protoplanetary disk formation
Primary atmospheres begin to form during the early stages of a solar system's development. As a star forms from a collapsing cloud of gas and dust, the remaining material flattens into a rotating disk around the star, known as the protoplanetary disk. This disk is rich in gases like hydrogen and helium, which are the most abundant elements in the universe.
Accretion of gases
Planets start to form within this disk through the process of accretion. As dust and solid materials coalesce to form planetesimals and eventually protoplanets, these bodies begin to exert gravitational forces. The gravity of these growing protoplanets attracts surrounding gases from the protoplanetary disk.
The public source identifies “Primary atmosphere” as atmosphere of a protoplanet. This brief keeps that definition visible, then builds a research path around Primary, atmosphere and Atmosphere.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Jun 23, 2026. The linked authority identifier is Q7243099. None of the 0 selected statements returned an explicit reference.
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This entry incorporates text from “Primary atmosphere” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.