Beginning of Essay
A fusion reaction is one in which two atomic nuclei merge to form a heavier nucleus. this is the process that happens in in the stars. In average stars, like the sun, the process of fusion is converting hydrogen nuclei (or protons) into helium nuclei. There is ....

Middle of Essay
.... and override their repulsion is through enormous heat, this method is called thermonuclear. Even though fusion reasearch still needs a lot of time, there has been some progress in discovering how we can use this. The two fusion reactions that are the most promising both involve the heavier isotopes of hydrogen: 1) deuterium (composed of one proton and one neutron) Deuterium occurs naturally as a minor constituent in all hydrogen-containing materials--such as water--in quantities sufficient to meet all the energy needs of societies for many billions of years. 2) tritium (composed of one proton and two neutrons). Tritium can be bred fr ....