This level may be difficult for some because there are three pigs that are orbiting around the main planet.
Luckily, getting 3 stars is very easy. You need only 90,000 points to achieve.
Timing is key for completing this level. Send Terence towards radioactive asteroids. It should cause to inflate some pigs at the main planet. Use another birds to clear all pigs. You can getting 3 stars using all birds.
Getting 3 stars
Difficulty: Very Easy
You can get three stars easily even you use all birds. Buy you have to destroy enough. It's extremely easy.