I've thought of a great way to keep everyone happy: Create 2 mod packs! Mod pack 1: Realism: You CANT land on Jupiter, there are NO MOBS spawning on any planet because zombies are unrealistic. There are no alien villagers, because we know there is no intelligent life out there. There is no cheese on the moon cause that would be silly right??? You cant get Oxygen on the moon because there is no atmosphere to grow trees to plug in the O2 collectors. You are running around on a ball of dust with nothing to do ... enjoy! Mod pack 2: game/fun You can land on planets that you wouldn't be able to in real life because this is a game and having fun and variety is more important than scientific correctness. Zombies, skeles and a lot of other sci-fi or fantasy based mobs spawn all over the place. 3 headed creepers are okay because this is minecraft not a space sim. No-one cares that it isn't 100% realistic because it is a game.