[RCCCL]

I haven't had the teck levels for a number of versions to create one, but you have to make sure there are enough of the right components, only one star in the system, and make sure there are no non component ships or colonies(and maybe even units)within 6 spaces of the sun.

:Edit:

I forgot to post this, and I don't know if it has been addressed, but in 1.07 I kept running into a problem with ground combat. If during the space combat, while troops are being deployed, a planet launched fighters, and at least one fighter was damaged to a point where it had no movement, but was undestroyed, during ground combat I would be unable to conquer the planet. It seems the fighter would be stored back on the planet after the space combat, but for whatever reason would not be there during ground combat, and if it has no movement it will not launch in subsequent space battles. The only solution I've found is to have ships bombard the planet, at the cost of my own troops, till the lone fighter is destroyed, in which case the planet immediately falls under my control without any further ground combat.