This section provides an overview of the history of the Manhattan Project, the key organizations involved, the science behind the bomb, and more.
Before the Trinity test, Manhattan Project officials realized that a calibration explosion using ordinary high-explosives would be useful.
The 509th Composite Group was organized as the weapon delivery arm of the Manhattan Project.
African Americans played an important, though often overlooked, role on the Manhattan Project.
The Manhattan Project ushered in the Atomic Age.
The Alsos Mission goal was to learn how close Germany was to developing its own atomic weapon.
Although the Manhattan Project was overall a surprisingly safe project, there were a few tragic accidents.
Some of the terms encountered when perusing the website can be confusing or obscure. This glossary is provided to assist readers and learners of Manhattan Project history.
The Japanese attack on Pearl Harbor brought the US into World War II.
President Franklin D. Roosevelt authorized the research, development, and production of an atomic bomb despite great uncertainties.