I have a planet that I have colonized but want to give to someone else. I realize I have to abandon it but the planet has some pretty sweet structures on it (interrogation center, statue of magnus, all the artifact drop structures, etc etc). I am assuming that abandoning it will erase these structures. He is in my legion and the planet alerts go away if i leave it so that he can invade it from me, or so I have been told. So does anyone know a loop hole where he can get my planet with the structures still on it?

On a totally off topic subject ( I didnt want to make a whole other post), The Dark Void artifact gives a planet a one day 100 cloak which is not really much in my mind. What makes them completely worthless is that they then cost five energy to use. Would it be possible oh mighty Galaxy Legion people/Dan to get rid of the energy to use them or make them worth the energy

I whole heartedly agree with those stinking voids. I cry every time I get one in the arty draws, which is about 1 or 2 a day, and promptly scrap them.

As far as the planet is concerned:
first: yes if you abandon the planet, all structures will immediately be destroyed.
second: It used to be you could alert the planet and leave the legion so they could invade but this is not longer doable. This only leaves you with 2 options. Either someone else in the legion has to have the plaent already in their database so they can alert it, you leave the legion, and the person that you want to give it to invades it, or you alert it, abandon the planet, and they invade it. The later is your only option if no other legion member has it in their scan bank. As far as the structures are concerned, the only one that might be of value is the statue of magnus. If I recall correctly it's a mission structure available from a limited amount of missions, which does make it fairly valuable. The rest don't make a difference. Interogation centers are easily farmable drops, and the arty structures from arty pulls are a dime a dozen.

The Interrogation Centers just depend on your level though, I can't get them anymore : (

It sounds like you mean Void Shells, and those are used for a mission now, it's repeatable and gives a structure for 1 space and 110 cloak.