The Manhattan Project succeeded in developing two types of atomic bombs: the uranium bomb and the plutonium bomb. The uranium bomb, code-named "Little Boy," used highly enriched uranium as its fissile material. The plutonium bomb, code-named "Fat Man," used plutonium-239, a radioactive isotope of plutonium that was produced in nuclear reactors.
The Manhattan Project led to the atomic bombings of Hiroshima and Nagasaki in Japan in August 1945. These bombings resulted in the deaths of hundreds of thousands of Japanese civilians and ultimately led to the surrender of Japan, ending World War II.
The development of the atomic bomb had profound and far-reaching consequences for the world. It ushered in the era of nuclear weapons and marked the beginning of the Cold War between the United States and the Soviet Union. The Manhattan Project also raised significant ethical and moral questions regarding the use of such destructive technology.