[Salone]

Oh no, planets are only added to new game files. They will not be there in old ones, and you can still play without them. And the gravitational field is very gradual. Not sure how long it's been for you, but they now have Ion Thrusters (space only, very weak in atmo), Hydrogen Thrusters (extremely powerful in atmo and space, but require hydrogen fuel and conveyers), and atmospheric thrusters, which are just turbines. I...love the design of the atmospheric thrusters.