Get back to the normal island and then go to poptropica cheats!
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. (see related questions)
Yes, anytime you are back on the Pewter Moon.
where is the boss on pewter moon poptropica
Seen through the Planetarium's telescope, the moving vehicles are spaceships coming and going from the Pewter Moon. Mordred may have eventually reached there when he fled Arturus twenty years ago.
get the fuel and put it in the rocket ship and put in 56 and 52.
On the Pewter Moon, see the manager at AstroZone about replacing your ship.
To get there from Arturus, the coordinates are X-56 Y-52. These are technically the coordinates for the planet Poptropica, around which the Pewter Moon orbits.
The missing page is under his bed at the museum, and gives the coordinates for the Pewter Moon. The rest is just the island storyline.
The first time, you have no choice. Fix the saucer and launch it (see the related question). Once you have a spaceship, you can land on Poptropica, the Pewter Moon, or any planet by clicking on it. (The exception is the ice planet, see related question)
After going to fullmoon island, you need an Nintendo event to go to new moon island.
Somehow
The saucer, once repaired, only takes you as far as the Pewter Moon (X 56 Y 52). From there, you build another spaceship to travel to the 3 planets on the Queen's list.