Here you will learn how to get three stars on world 2 level 18 of angry birds space
Here is an easy way of getting three golden stars on angry birds space 2-18. Put your finger on your phones screen and pull back on the slingshot. Aim it as seen in the screenshot above. The big green bird will make the tower collapse and take out the pigs. Also the debris will in this way fall both left and right and take out the pigs on either side of where you initially hit. Congratulations on finishing another level with all the stars. Also worth noting is that the ice crystals on the planets surface will rack you up a lot of points if you take them out in the process.
Video walkthrough of angry birds space 2-18 to help you even more: