Here is our Space Eagle Total Destruction video walkthrough for Angry Birds Space Cosmic Crystals level 7-4. Aim the Sardine Can just south of the TNT on the east side of the level. Quick, simple, and devastating.
If you have an alternate strategy please feel free to leave a detailed comment below.
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Sardine Can into the pig below the tnt plunger. Activate upon impact on the plunger side of the pig. Lower crystal planet did not get destroyed.