Angry Birds Space Danger Zone Level 27 Walkthrough - AngryBirdsNest.com

If you miss the right hand pig on your first shot, follow the same instructions but take out the left and stack first. With the second laser bird, fire it before it enters the gravitational field and take out the base scaffolding on the right hand stack. That should kill even the elusive pig and give a score of 150,000+

Much easier like this:
1: red bird hitting the base of the pyramid looking pile on the big planet. TNT has to detonate.
2: nxt bird below the big planet and the laser shot through the gap
3: third bird through the gravitation field of the big planet (upper side) all the way to the right hand planet. Laser shot through the base part of that structure will detonate the TNT and you are done!

Aim the red bird to the upper part of the big planet, shoot him just over the triangle wire that’s attached to the far left piece of wood. If you shoot the red bird right he will crash through the stone bricks and detonate the TNT at the top of the big planet, killing almost all the pigs on that planet. Then shoot your first purple bird under the big planet and through the gap to detonate the TNT on the wire at the right side of the big planet, this will destroy the remainder of pigs on the big planet. Lastly, shoot the next purple bird inbetween the big planet and the up high planet, wait till the right moment and redirect him to the far right planet through the wire boxes into the TNT. With a few tries this was much easier for me than the video on AngryBirdsNest. I scored 150,100.

MUCH EASIER SOLUTION TO DANGER ZONE 27 (Consistently scores >150,000 points):

1) Launch Red Bird into the left side of the gravitational filed around the largest planet, aiming it so that it just misses the handle-like structure protruding out to the left of the structure on the planet and hits the stone wall just above the junction between the two stone blocks. This should detonate the TNT and destroy the entire structure.
2) Launch the first Lazer Bird also to the left of the largest planet, but keep it out of the gravitational field. Once it lines up with an imaginary line connecting the two points where the edges of the gravitational fields of the largest and smallest planets cross, redirect it to hit the lower left corner of the structure on the mid-sized planet. Aim it at the lower right corner of the rectangular open block with the single diagonal that is underneath the square open block with the two diagonals. This should cause the structure to collapse, detonate the TNT, and wipe out that pesky pig sitting by itself. If you are VERY VERY lucky, you might hit one of the boxes of TNT under the train and destroy it too, thereby completing the level with two Lazer Birds to spare.
3) If you are not lucky, aim the next Lazer Bird, also to the left, so that it JUST misses the gravitational field of the largest planet and passes through the gravitational field around the smallest planet, which it uses to slingshot around it. Once it lines up with the clear area between the gravitational fields of the smallest and mid-sized planets, redirect it to hit the middle box of TNT under the train. This should destroy the entire structure and complete the level with one Lazer Bird to spare. (Another option is to hit the right-most box of TNT under the train, but this is more difficult to do).