I've looked in the forums and haven't seen this addressed anywhere, though it is possible I could have missed it. I was playing a multiplayer game and tried to attack one of the other player's emancipation gate with a dreadnought but it wouldn't do anything except show the attack stats for both units. Can you attack a planetary wonder like the emancipation gate with a ranged unit like the dreadnought or is it because it's a naval unit or some other reason? Any help would be appreciated.