User blog comment:GrandMethuselah67/Lore Sheet: The People's Imperium of Neohumanity/@comment-4867780-20150713075909/@comment-26322734-20150713083437

Actually, the "colder than absolute zero" thing was the negative temperature thing we were talking about in the chat earlier. They managed to find a way to eliminate zero-point energy from a quantum mechanical system (that is, the electron vibrations that still happen even when an atom is absolute zero).

Lol, probably!

Yep. And that's why it's strictly kept out of the hands of common citizenry (among other weapons).

And yeah, the Supernova Bomb was created as a result of a (currently ongoing) arms race going on with the U.R.H and Kazzack's Hive. Of course, many ethical questions came up when such a weapon was built, but the United Government is a little more concerned with eliminating Kazzack than wartime ethics.