[dogscoff]

If you have fightrs that means you hav the construction tech lvel... which means you can research troops. A few dozn troop units will calm down a planet considerably. Ships help as well.

I have also heard of a cheat/ exploit where you move all the population off the planet using the "abandon colony" button (but leave the facilities in place) and then put them all back again. The planet's happiness rating is reset. Of course this isn't a particularly honest way of playing...

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"Pinky, are you pondering what I'm pondering?"
"I think so, Brain, but if they called them sad meals, kids wouldn't buy them."