This is kinda like Space flight Sim. In Spaceflight Simulator, you will get to build your rockets, plan launches and flights, attempt landings, deploy payloads and explore new worlds. Earth has an atmosphere meaning you will burn up if you don’t have a heat shield. Mars is a bit less but still has one. Venus has a very thick one. Everything else does not have one. Like moons. Except exceptions like Titan. Rovers you make can be rebellious and might rebel. And go rouge! Very often to happen.