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Snow Line / Frost Line

The snow line (otherwise known as the frost line) is the location at which the temperature from the central star of a protoplanetary disk or planetary system becomes low enough for certain volatiles to remain in their liquid or solid forms. This line also creates the distinction between rocky and gas planets.

Mathematical Distinction
In order to derive the radius of the frost line,

Planetary Formation
During planetary formation, whether or not a planet is able to accrete volatile materials determines its composition and formation.