Use the hovercraft in the mill's attic to reach the crashed saucer Excalibur in the mud swamp. Fix the saucer and use Mordred's coordinates to fly to the Pewter Moon.
(see related questions)
press the moon button then figure out the combination
When the Excalibur crashes on the Pewter Moon, go to Astro Zone and the manager will arrange for you to have a new ship holographically constructed outside.
To see the solar system on Astro Knights island, go to the Planetarium. (not part of the game, but an interesting view)
Go on youtube
x-56 y-52 it will get you to the moon. the moon is the only place you can go on the flying saucer
OK. You click on the moon, Saturn (the planet with rings around it), star, and then the sun. There you go!!
go to the moon and there will be a building ask the owner wether you can costumize your space ship good luck
You can go to space on Astro Knights
go to the secret door
On the Poptropica website, all of the available islands are displayed on the Island Map.
With the saucer Excalibur, you go to the Pewter Moon, and there you make a real spaceship to travel the solar system. (see related question)
Once you fix the crashed saucer Excalibur, you can go to the pewter moon and build a new spaceship there. (see related question)