The idea for the Hydrogen Bomb began with Edward Teller and his plans for a "super" bomb. The hydrogen bomb was built in 1952. Teller and Enrico Fermi first studied whether or not a hydrogen bomb was possible in 1942. They believed that it might be possible after looking at research on thermonuclear reactions in stars. Teller at first wasn't too sure that a hydrogen bomb would work because of the extremely high temperatures required for thermonuclear reactions, which could also burn the atmosphere. During World War Two, Teller and his team discovered that much less materials would be reqiured than originally thought.