"This is the prototype NOVA Bomb, nine fusion warheads encased in lithium triteride armor. When detonated, it compresses its fusionable material to neutron-star density, boosting the thermonuclear yield a hundredfold. I am Vice Admiral Danforth Whitcomb, temporarily in command of the UNSC military base Reach. To the Covenant uglies that might be listening, you have a few seconds to pray to your damned heathen gods. You all have a nice day in hell..."
―Vice Admiral Danforth Whitcomb's recording on the NOVA Bomb that detonated outside of Joyous Exultation
The NOVA Bomb is a United Nations Space Command weapon created from the combination of multiple nuclear warheads. During the Human-Covenant War, several of these weapons were produced at CASTLE Base, located on Reach. They were made and developed and secret, but their existence was known to a wide variety of Military Intelligence Division personnel. There was only one recorded detonation of a NOVA bomb during the Great War, at Joyous Exultation, a Covenant planet. Another unconfirmed detonation occured at Ceres sometime following the Great War.