Planetary Invasion: How is Advantage Calculated?

I am trying to play a cultural conqest game and have been getting creamed by invasions. There will be an enemy transport heading toward SOL and I think "no prob, I have 5 billion people whats that measly 1 billion going to do" Wipe me out thats what! This happened maybe 75 turns into the game. Their advantage when it came time to press the space bar was 14 to 3? So my question is what influences the advantage numbers? Is it just normal for the attacker to have the advantage? Am I missing some key tech? Its really frustrating that invasions are so ridiculously easy.

~SDC~
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Yes, the attacker always has a rather huge advantage up to something like 15:1 if the defender is out of luck. It's explained somewhere in the manual. If you want to hold off transports, a single scout should do the trick if the transport is alone. Otherwise, you'd better build some defenders or better. Later in the game, you also get improvements to soldiering ability, which could help in defending the planet.

Overall: orbital defense is about the last line you have. Once they're on the ground and don't face a large population (don't you try to invade my Vesta system... 53bn people there on one planet), it's over.

~SDC~