rename planet X - Where 'X' is the desired name.rename star X - Where 'X' is the desired name.
You may rename everything in your own system BUT your homeworld. In the Space Stage, go to a solar system that's not yours (or another save game's) and press CTRL+SHIFT+C. Then when you finish that stage and advance to the Tribal stage that follows, those pack members will appear in your tribe's pen as domesticated animals. As you play through the Creature stage, make sure you have members of other tribes in your pack.