>>11446245Silicon is a fine material for "top-down" fabrication, lithography, etc, but it doesn't have complex enough chemistry for "bottom-up" processes on the nanoscale. Any self-replicating system is almost certainly going to have to operate at the level of individual molecules rather than bulk materials, so all the issues with silicon chemistry still apply.
>>11446249If you're talking about a planet with a different mass so the gravity is stronger/weaker, the same laws of chemistry still apply. No amount of high pressure of extreme conditions is going to get you robust silicon heterocycle chemistry, and in fact it will probably make everything else worse.
If you're talking about changing the actual physical gravitational constant, then all bets are off, but there's no good reason to assume that the laws of physics are different elsewhere in the universe.
