<em><u>Nuclear fusion</u></em> reactions convert protons into helium; thus, becoming the source of all energy radiated by the sun.
<h3><u>Explanation;</u></h3>
<em><u>Nuclear fusion is a type of nuclear reaction</u></em> in which two or more nuclei of atoms join to form one or more different atomic nuclei and subatomic particles.
<em><u>Nuclear fusion takes place in the sun where protons or hydrogen nuclei collide in a nuclear fusion reaction at very high temperatures to form Helium.</u></em> This nuclear fusion results in the conversion of 4 hydrogen atoms into helium atom.