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National Museum of Nuclear Science & History

The Trinity Test

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The Detonation
Capturing the Trinity Test
Eyewitness Accounts
Making Sure Nobody Noticed
A Long Night’s Vigil
Now I Am Become Death
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Quick Fact:
At 5:29 AM, the "Gadget" nuclear device detonated at the top of the 100-foot steel tower. The device yielded between 15 and 20 kilotons of force, slightly more than the Little Boy bomb dropped on Hiroshima. The Atomic Age had begun.