what is hydrogen fusion this process is sometimes called
The process by which stars use hydrogen is known as fusion. Fusion is the process by which two or more small atoms are pushed together to make one large atom. In most stars, the primary fusion reaction that occurs is: This equation shows that four hydrogen atoms are squeezed together (fused) to make one helium atom.he process by which stars use hydrogen is known as fusion. Fusion is the process by which two or more small atoms are pushed together to make one large atom. In most stars, the primary fusion reaction that occurs is: This equation shows that four hydrogen atoms are squeezed together (fused) to make one helium atom.