Cosmic Crystals 7-6

Cosmic Crystals 7-6 is the sixth level in Cosmic Crystals. The objective of level 7-6 is to use the birds to eliminate all the pigs. Get at least 28,000 points for 3 stars.

Difficulty
The smallest planet is very annoying.

Strategy 1
Loop the Red Bird around all three gravitational fields by going below the southern planet. Smashing the northernmost planet twice will break the crystal, clearing the level.

Strategy 2
Use two Red Birds to break the rightmost southern planet which TNT, cause to break the crystal planet and clear the level. This strategy is not guarantee for three stars, but it's the easiest way to win.