Three days later the plutonium bomb was used to bomb Nagasaki. The two bombs killed approximately 150,000 people when they fell. After the war, hyrogen bombs and other nuclear weapons continued to be developed by the United States and its former ally the Soviet Union. Nuclear fission was also put to civilian use in power generators in several countries. They made cheap electricity and were a source of radioisotopes for other types of research, but came with their share of problems and dangers.
Reactors are still in use, but in many places have fallen out of favor as an energy source.
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