Invading core worlds

I am playing a game where I have successfully invaded core worlds with one transport per invasion force. I am now attacking the Yor and some of their core worlds do not allow me to attack them. Is it just a matter of adding more transports to my fleet?

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They probably have a military starbase near the planets.  All planets in the area of effect of a military starbase cannot be invaded.  This applies to core worlds and colonies.  You must find and destroy the military starbase first.  There should have been a message about this when you tried to invade the planet.