A cobalt bomb was a type of nuclear weapon that had less than 1/10,000th of the destructive yield of an ounce of antimatter.

In 2268, Ensign Garrovick compared the explosive forces of the two weapons to Captain James T. Kirk. (TOS: "Obsession")

An ounce of antimatter corresponds to an explosion of 1.22 megatons. This indicates 23rd century cobalt bombs had yields of less than 122 tons of TNT.

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