These mushroom clouds directly addressed new sources of anxiety: the arms race (set off after the Soviets’ 1949 atomic test), the effects of radiation, and the hydrogen bomb and its even bigger ...

Mushroom clouds are commonly associated with nuclear blasts, but this cloud will come from the detonation of a 700-ton explosive charge designed to test new bunker-busting technologies.

“A mushroom cloud has grown today. This is probably a hint that the ‘mushroom season’ is in full swing,” @khsy_20_ posted on social media. “It is time to pick mushrooms.

But when he saw a mushroom cloud 200 miles in diameter rising to 60,000 feet from 14,000 in about two minutes –that`s about 260 miles an hour–he first thought that it was a Russian missile.

Notice the mushroom cloud forming immediately after the explosion. (Image credit: Bettmann Archive/Getty Images) When a bomb goes off, energy is shot out indiscriminately in all directions.

SEATTLE -- A cloud formation in Seattle Wednesday morning had the ominous appearance of a mushroom cloud. It looked fake, but it wasn't. Several viewers reported seeing the cloud formation. KING 5 ...

In a test called "Ivy Mike," the world's first hydrogen bomb explodes on Enewetak Atoll, November 1, 1952. Nuclearweaponarchive.org He wasn’t supposed to do it, but on May 15, 1948, Lieutenant ...

It looks fake, but it isn't. A cloud formation in Seattle Wednesday morning had the ominous appearance of a mushroom cloud. Kathy Fisher snapped a picture while in standstill traffic on Highway 99 ...