The most powerful bomb ever detonated on earth was the Tsar Bomba in 1961. The test was carried out on October 30, 1961. According to Britannica.com, “…it was modified to yield 50 megatons…about 3,800 times the strength of the U.S. bomb dropped on Hiroshima during World War II. It exploded about 2.5 miles (4 km) above the ground, producing a mushroom cloud…