This is not a photograph, it was actually a painting. Is that amazes you? Click here for more details on it.
Btw there are some inspiring paintings from some amazing artists (also known as a photo-realist painter), here the link you can check out the rest of their great works.
The bomb was tested on October 30, 1961 in Novaya Zemlya, an island in the Arctic Sea. The 57MT-bomb exploded and a mushroom cloud with a height of 64km rose to the sky...