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United States tests first hydrogen bomb
US tested first thermonuclear weapon with help from Gerwin and Teller on Eniwetok in the Pacific. This new weapon was 1,000 times more powerful than the convential nuclear device which is why hydrogen bomb research and development over-shadowed atomic nuclear weapons. -
The Russell–Einstein Manifesto is issued
Created in London on July 9, 1955 by Bertrand Russell in the midst of the Cold War. It highlighted the dangers posed by nuclear weapons and called for world leaders to seek peaceful resolutions to international conflict. Einstien signed it too, days before his death. -
Soviet Union drops hydrogen bomb
Soviet Union dropped hydrogen bomb from airplane in Siberia where is was very remote. Much less powerful than one dropped at Bikini but made Americans nervous. -
The United States conducts the first airborne test of an improved hydrogen bomb
The United Stes dropped the improved hydrogen bomb from a plane over the tiny island of Namu in the Bikini Atoll in the Pacific Ocean. The successful test indicated that hydrogen bombs were viable airborne weapons. -
Britain drops its first hydrogen bomb
The test was carried out at high altitude over the largely uninhabited Christmas Island to minimise nuclear fall-out.
