Upgrading a planet can effectively enhance the planet's production capacity and population. It can also extend the operational time of resource production!
In addition, all Lv. 7 planets support the "Fast Harvest" function. This makes it easier for you to develop your planets!
If a planet is currently in the middle of producing resources, you cannot upgrade it. (This is to ensure you don't lose any of those resources!)
Otherwise, to upgrade a planet:
- Harvest any resources it has finished producing.
- Wait for the planet to be hungry.
- Tap the upgrade button at the bottom to upgrade the planet.