[Pooka]

Remember you must decloak to attack. You could plant them on top of the planet one turn, then decloak and attack the next. But why not use a reasonable sized fleet? Then if any defences are present, you can take them out. Also, fleet strategy "capture planet" and troop ship strategy "capture planet"!

I'm thinking... you should check out the the Newbie FAQ stickied to the top of the forum.

First thing I did, actually. The sections on cloaking and stealth armor didn't make sense after reading the confusing text of components under SEIV. I am grateful to have the means by which I can use stealth armor to cloak cleared up now.