Here is our Space Eagle Total Destruction video walkthrough for Angry Birds Space Cosmic Crystals level 7-15. Toss the Sardine Can straight ahead toward the northwest planet. Easy peasy.
If you have an alternate strategy please feel free to leave a detailed comment below.
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1. Blues into the base of the stone rocket on left. It turns into the left crystal planet and it blows up. The middle rocket turns to the right and flies into the right crystal planet which causes that one to disappear.
2. Aim the Sardine Can into the lower atmosphere of the bottom crystal planet so it comes up on the right side and activate it in the atmosphere. Planet goes away and the debris hits the far right rocket so it moves right and takes out the crystals on the stone planet.