1.Introduction of planets ressources or technological depedences in order to differenciate planets importances.
2.possibilities for starbase or titans to destroy definitively the surface of planets and then it can brake technological or abilities depences to the destroyed planet.
3.System of stargates that can help you to teleport an army dirrectely to a far planet in order to attack or defend,your self
,could be also used against enemyes .
4.destroyed ships give metallic ressource.
5.possibilities to capture a planet without destroying it,it gives you all his ressources.
6.an ally can return him if you pay.
7.Planets turns around their sun.
