New Sci Fi Setting Seeds

[Astromancer]

Originally Posted by malloyd

The central problem with this as a plot is the Gray Goo isn't relevant at all.
The Russians (or Americans or Chinese or Europeans) could have done this at any time in the prior 7 decades or so, with nuclear weapons, and didn't. Any reasons (and countermeasures) are essentially unchanged by the invention of a new kind of doomsday bomb.

The Grey Goo is smaller scale that the bomb, vastly easier to hide, and well suited to asymmetrical attacks. This is basically a spy verus spy world.