Here is our Space Eagle Total Destruction video walkthrough for Angry Birds Space Cosmic Crystals level 7-17. Aim the first Sardine Can toward the northwest planet and a second toward the southwest. Between the two of them, enough debris should fall onto the largest planet to cause it to rupture.
If you have an alternate strategy please feel free to leave a detailed comment below.
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For those looking to save eagles, you can do this with one by firing the first bird as if going for three stars. Use the eagle for the second shot (getting the last pig or quickly firing at the last planet if you get all the piggies on the first shot). You need to destroy all three planets to get the feather.
1. Red Bird into the lower largest stone so it travels up to destroy the large crystal planet. Debris destroys the upper crystal planet and pig.
2. Land the Sardine Can on the smallest crystal planet to clean up the remaining pig and planet.