Use the UFO. (The saucer Excalibur in the mud swamp past the mill.) To use it you need to find a fuel rod and the coordinates. Once you get to the Pewter Moon you can make a new spaceship.
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To fly to the Pewter Moon on Astro Knights Island, you need to build a spaceship by collecting spaceship parts found throughout the island. Once you have assembled the spaceship, you can use it to fly to the Pewter Moon by clicking on it and selecting the moon as your destination.