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: The '''main sequence''' stage of a [[star]]'s life is the longest and most stable stage.
: The inward [[pressure]] on the [[matter]] of the [[star]], due to [[gravity]], is balanced by the outward pressure on the [[matter]] of the [[star]] due to [[Nuclear Fusion|nuclear fusion]] of [[Hydrogen]] [[heating]] the [[matter]] so the [[star]] remains at a constant size.
: During this stage [[Rest Mass Energy|rest mass]] is converted to [[energy]] due to the [[Mass-Energy Equivalence]] by the [[Nuclear Fusion|fusion]] of [[Hydrogen]] [[isotopes]].
: [[Energy]] from the [[Nuclear Potential Energy Store|nuclear potential energy store]] is [[Energy Transfer|transferred]] to the [[Thermal Energy Store|thermal energy store]] of the [[star]].