<P> At present , nearly half the hydrogen at the core has been consumed , with the remainder of the atoms consisting primarily of helium . As the number of hydrogen atoms per unit mass decreases , so too does their energy output provided through nuclear fusion . This results in a decrease in pressure support , which causes the core to contract until the increased density and temperature bring the core pressure into equilibrium with the layers above . The higher temperature causes the remaining hydrogen to undergo fusion at a more rapid rate , thereby generating the energy needed to maintain the equilibrium . </P>
will the amount of hydrogen in our sun increase or decrease over the next few million years
decrease