When the outward-directed gas pressure (created by thermal nuclear energy) is balanced in a stable relationship with inward-directed gravitational force results in main sequence star.
The pressure is the force exerted per unit area.
A main sequence star fuses hydrogen in its core and has balanced outward pressure from core nuclear fusion and gravitational forces will be pushing inward.
When the outward-directed gas pressure is balanced in a stable relationship with inward-directed gravitational force results in main sequence star.
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