There is enormous energy in the universe. The energy is caused by the thermonuclear reaction and gravitation. Most young stars contain large amounts of energy that is yielded by the fusion process. In fusion process reaction, two light atomic nuclei fuse together to form a heavier nucleus (in contrast with fission process). In the process, a little mass is lost and a large amount of energy is generated. The dying stars also contain a large amount of energy that is yielded by the fission process. In fission process reaction, a heavier nucleus splits into two lighter atomic nuclei. Similarly, a little mass is lost and transformed into a large amount of energy.
At present, thermonuclear power occupies about 25% of the energy ...
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