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What is the target of Yamato in the anime "Space Battleship Yamato 2199"?

Go to the alien planet "Iscandar" for the purpose of receiving a pollution purification system.

The Yamato, anchored on Earth, successfully broke through the speed of light in the solar system. With humanity’s last glimmer of hope, we embarked on a one-year journey of 336,000 light-years to the planet “Iskandar” in the Large Magellanic Galaxy.