Nuclear Gravity Bombs

The United States' plans to build new nuclear gravity bomb will be designated as B61-13.

Gravity bombs work by being pulled to the ground by the force of gravity instead of flying to the target on a powered missile.
In this case, a bomber or an aircraft flies over the target and drops the bomb.
These bombs do not consist of a guidance system and, hence, follow a ballistic trajectory.
B61 – 13 - According to reports, the new bomb is estimated to be 360 kilotons, which is roughly 24 times powerful than the blast that destroyed Hiroshima.

The 2 bombs that the US dropped on Japan's Hiroshima was about 15 kilotons (or) 15 thousand tonnes (or kilotons) of TNT equivalent and Nagasaki was of 25 kilotons.

The B61-13 will replace the 1980s era B61-7. The maximum yield of the B61-12 is 50 kilotons.
The warhead reportedly had options, including 0.3kt, 1.5kt, 10kt, and 50kt.
The B61-13 is intended to have the same yield as the B61-7, but with the modern safety, security, and accuracy features common to the B61-12 line currently in production.

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