Launch Princess Leia at a northern hemisphere of the planet. Pull the rightmost TIE Fighter and largest asteroid which is next to it to crush the upper structure and detonate the TNT. Cause the small iron towers fall down to the center. If necessary, use Han to finish the level. If your score is too less to get three stars, use the last bird to pull the large asteroid to the upper ruin.
Send Leia above the structure in the middle of the level, pulling at the outermost asteroid. A little lucky, the tower of stones topples onto the aforementioned structure after just one bird, but it isn’t ultimately necessary. With Han, blast the remaining TIE Fighter, but from an angle so it severed wing blasts the TNT below. Use the last bird to pull the other large asteroid to the ruin if necessary.
Send Leia above the planet. Pull the easternmost asteroid to destroy the left TIE Fighter and crush the upper structure. Cause the small iron towers fall down to the center. Use Han to finish the another TIE Fighter. If necessary, use the last bird to pull the large asteroid to the upper ruin.
See Video Walkthrough.