Use your first shot to get rid of the green armor pig. Once the pig is gone, all the wooden pieces fall into the planet and kill the pigs. Launch with the angle shown in the screen shot.
Power Activation Point
Tap your laser sword as you are nearing the first pig on the bottom left planet.
First Shot Result
All the pigs die except for two. You will use your next shot to clean them up.
Launch the final shot into the top planet.
Second Power Activation Point
Shoot your laser to kill both of the pigs in the picture.
Second Shot Result
The triple mastery star is yours once all the pigs are dead.