Angry Birds Star Wars Bonus Level #1 (S-1) is unlocked by accumulating 10 stars through gameplay in Star Wars. Once you have accomplished this task, you will be prompted and can either navigate directly to the level or access it via the Bonus Episode. Fling R2-D2 straight ahead, zapping three pigs and releasing the barriers. Then use C-3PO to detonate one of the TNTs in the asteroid field, popping all bubbled pigs.
Go back to the Complete Star Wars Golden Droids & Bonus Level Guide. If you have a different strategy feel free to leave a comment below; however, don't just post your score via the comments, as that's what the leaderboards are for.