Scientists simulated a nuclear fireball and found a surprise in the fallout

When a nuclear weapon detonates or a serious reactor accident occurs, an immense burst of energy is released in less than a millionth of a second. The extreme heat instantly vaporizes nearby air and materials, creating a brilliant, expanding cloud of gas and plasma. As this nuclear fireball grows, it mixes with the surrounding atmosphere, cools, and eventually condenses into tiny solid particles that become nuclear fallout.

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