The Creation of the Atomic Bomb & The
Manhattan Project
Background
During World War II, fears that Nazi Germany was developing a powerful new weapon
pushed the United States to begin its own secret program to build an atomic bomb. This
top-secret effort was known as The Manhattan Project. It started in 1942 and brought
together some of the world’s greatest scientific minds to harness the power of nuclear
fission for military use.
The Manhattan Project
Start Date: 1942
Goal: To develop the first nuclear weapon before Germany or Japan could.
Main Locations: Los Alamos (NM), Oak Ridge (TN), Hanford (WA)
Funding: Over $2 billion (around $30 billion today)
Key Figures: General Leslie R. Groves, J. Robert Oppenheimer, Enrico Fermi, Niels
Bohr, Richard Feynman.
J. Robert Oppenheimer’s Role
J. Robert Oppenheimer was an American theoretical physicist chosen as the Scientific
Director of the Manhattan Project in 1942. He oversaw the design and construction of the
bomb at Los Alamos Laboratory. Oppenheimer coordinated the work of hundreds of
scientists and engineers. He was deeply involved in both the scientific and moral
challenges of the project. After the war, he famously reflected on the destruction caused
by the bomb, quoting the Bhagavad Gita: 'Now I am become Death, the destroyer of
worlds.'
The Atomic Bombs
Two types of bombs were developed:
1. “Little Boy” – Uranium-based bomb, dropped on Hiroshima (August 6, 1945).
2. “Fat Man” – Plutonium-based bomb, dropped on Nagasaki (August 9, 1945).
These bombings led to Japan’s surrender, effectively ending World War II — but they also
marked the beginning of the nuclear age.
Legacy and Impact
The Manhattan Project changed warfare and global politics forever. It led to the Cold War
arms race between the USA and the USSR. Oppenheimer later spoke out against further
nuclear weapons development, becoming a symbol of the ethical dilemmas of science.
Key Facts Summary
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