[naveen99]

Habitable for silicon intelligence may be more common than habitable for carbon intelligence.

[ErigmolCt]

A machine civilization could probably spread into many environments that biology cannot tolerate, but it still has to be invented somewhere first

[bluGill]

There is no particular reason to think a process for silicon life couldn't exist that starts from something like our carbon based form started. We don't know what that is, but we have ideas.