Nagasaki Atomic Mushroom Cloud Ring: What Caused It?

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The ring around the atomic mushroom cloud in Nagasaki was caused by the presence of clouds on a cloudy morning. The explosion propagated radially, creating the distinctive ring shape. Without the clouds, the visual effect of the ring would not have been observed. The interaction between the explosion and the atmospheric conditions played a crucial role in forming the ring. This phenomenon highlights the impact of weather on nuclear explosion visuals.
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What caused the ring around the atomic mushroom in Nagasaki?

502px-Nagasakibomb.jpg
 
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Clouds. It was a cloudy morning. The explosion propagated radially. Without clouds present, there wouldn't be a semblance of a ring.
 

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