forget cargo facilities just build fighters on all of your planets and launch them ever turn and store them at the worm hole entrance or around one of your worlds as soon as someone enters the system put 5 billion fighters at them
of course my standard defence for small worlds is to not have small worlds they are not worth while just have big ones
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CyC
The Person not the AI
L+++ GdY $!+ Fr+ C--- S* T!- Sf++ Tcp++ A? M++ MpM RV Pw+ Fq++ Nd+++++ Rp++ G