Nuclear experts say this famous photo of an apparent mushroom cloud rising above the city of Hiroshima is not what it appears to be. The towering plume is actually billowing smoke rising up from the raging firestorms that followed the explosion.
The mushroom cloud that forms after an atomic blast is almost an iconic. People use the terms "mushroom cloud" and "atomic bomb" interchangeably. But why does it form? And does it only go up after a nuclear blast? Let's find out.