After an alien arrives on Earth, you'll need to help them return to their home planet. As a reward, the alien will help you by increasing your galaxy population (this increases your position on the Ranking page!)
How to help the alien start the Galaxy Travel:
- Go to the Hangar > Aliens > scroll down and tap the Alien Visitor Hall
- Tap an alien
- Tap Galaxy Travel to send them off on their Galaxy Travel
- Once the alien reaches the last planet on their journey they will have returned to their home planet!
- After the alien has reached their home planet, they'll be able to return to the other planets they'd visited on their journey any time they like!