Here is our Space Eagle Total Destruction video walkthrough for Angry Birds Space Cosmic Crystals level 7-21. Aim the Sardine Can straight ahead, just over the first ridge. One Can, one Eagle, one feather.
If you have an alternate strategy please feel free to leave a detailed comment below.
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1. Bounce the 1st Sardine Can off the crystal with the flashing red light. The can comes to rest on or near the wood triangle/gap on the right side of the structure.
2. Land the 2nd Sardine Can onto the far right tnt. It will destroy the flashing light and crystal and the feather will be awarded.