Energy is one of the most worrying problems in the world. There is a need to develop energy technology that is clean, sustainable and affordable to produce. Currently more than 85% of energy is produced by fossil fuels, which will run out sooner or later, which has well-known disadvantages such as limited reserves and an increase in climate-damaging greenhouse gases. Fusion is an alternative to all these types of energy sources, known as “unlimited” and “sustainable”. Fusing atoms in a controlled way releases nearly four million times more energy than a chemical reaction such as burning coal, oil or gas, and four times more than nuclear fission. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essayFusion is a process that occurs inside stars and is a reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles (neutrons or protons) that overcome the forces of Very high temperature Coulombs that exist in the core of a star, such as the Sun (15 million 0C). It is a highly exothermic process that releases high-level energy particles compared to fission that can produce self-sustaining reactions. The mass difference between the colliding particles and the resulting nuclei manifests itself as the release of a large amount of energy, which materializes by contrast in the binding energy between the nuclei before and after the reaction. This is expressed exactly by Einstein's famous formula; where the mass lost in the reaction is mec is the speed of light. Some fusion reactions of interest are given below, and the most accessible is that involving deuterium and tritium, the two isotopes of hydrogen. Everything in the universe begins with a big bang, as does fusion. The process of nuclear fusion in stars is limited to elements lower than iron, as it would take away energy rather than provide it as it is one of the most tightly bound nuclei. Thus, a prerequisite for the fusion reaction is that the colliding nuclei are lighter than Iron-56 or Nickel-62, since these elements have the smallest mass per nucleon and the largest binding energy per nucleon, creating respectively an exothermic reaction. These fusions of these light elements release energy (an exothermic process), while a fusion that produces heavier nuclei of these elements will result in energy retained by the resulting nucleons, and the resulting reaction is endothermic. Reversibly, the heavier Fe-56 nuclei require an external source of energy for the reaction to occur. Therefore, lighter elements such as hydrogen, deuterium, and helium have a higher probability of fusion than heavier Fe-56 elements such as uranium and plutonium, which are more likely to break apart, which means fission. Only extreme cosmic events in interstellar entities can produce enough energy to fuse nuclei into elements heavier than iron.