Level F-1

Level F-1 is the first level of Sardine Can Levels. To unlock this level, you must collect all feathers in Pig Bang.

Difficulty
Easy to total destruction.

Strategy
Fire the first sardine can just northwest of the large asteroids, pushing them all the way to the eastern planet. This should trigger a wave of TNT and destruction.

Walkthrough
http://www.angrybirdsnest.com/angry-birds-space-pig-bang-bonus-level-f-1-walkthrough/