In my TNE-verse Det Nukes were crafted in such a way that any significant atmosphere around the nuke would result in the nuke warhead fragmenting/duding when the compression charge/laser/whatever tried to achieve a critical mass. Other safeties include basic densitometers to prevent detonation close to significant bodies (Earth, Vesta, Pamela Anderson...)
Of course, military-standard det-nukes didn't have the densitometers - but even then, if they wanted to nuke a world they'd use ordinance fit for the job.
Eamon
>From: "" <>
>The Imperial rule on nukes would have been re-interpreted in TNE to state
>"the use of nukes on a world," since all space missiles were nukes. But
>since there was no Imperium left, we probably didn't explain that. All
>space missiles were nuke-pumped lasers as that was the only way to
>realistically make missiles work. Getting skin-to-skin contact with HE
>missiles the way earlier editions assumed was just not going to happen.
Dave