The percent of hydrogen in the Sun's core today is roughly half of what it had originally.

Question

Quizplus · Accepted Answer

This is true. The Sun's core is powered by nuclear fusion reactions of hydrogen atoms fusing into helium atoms. As the reactions occur, the hydrogen is gradually depleted and converted into helium. Over time, the amount of hydrogen in the core decreases, which causes the fusion reaction rate to decrease and the core to contract and heat up. Currently, the core of the Sun is about 60% helium and 40% hydrogen, which is roughly half of its original composition.

The Percent of Hydrogen in the Sun's Core Today Is