<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>
<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
will the amount of hydrogen in our sun increase or decrease over the next few million years
decrease
decrease