Based on the nebular theory, which of these is a step in the formation of the center of a new planetary system? a) evaporation of condensed gases due to heat b) combination of condensed gases due to gravity c) contraction of condensed gases due to nuclear fission d) expansion of condensed gases due to nuclear fission .

In nebular Theory, it stated that Solar and Stellar System were developed from  a primeval nebula , which is the most generally accepted view on our current time,

Based on this theory, the one that is a step in the formation of the center of a new planetary system is :A. Evaporation of condensed gases due to heat

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2. they have negligible mass.