If you land back on Poptropica, your spaceship is parked atop the castle. This is also its location when you have beaten the island.
There's a lock under the hay in Astro Knights
you can't
The rocket is on top of the castle of Arturus.
go to astro nights and go to the castle and find your rocket on it. Fly back to mordred
To return to space on Astro Knights Island after completing the mission there, you can head back to the rocket ship in the observatory and select the option to launch it again. This will take you back to space where you can explore further or complete any remaining tasks.
Whenever you return to Poptropica planet (Arturus kingdom), your spaceship is parked on the roof of the castle.
It is on tp of the castle roof in astro knight island
At the end of the island quest, you receive the Island Medallion. At that time, or if you return to the planet Poptropica for any reason, your spaceship is parked on top of the castle.
You don't see him again, as apparently he is trapped in his far galaxy. However, he is somehow transported back to Poptropica by Dr. Jupiter on Super Villain Island. By the end of that island, you have an idea how he did it.
You can find your ship on top of the castle.
Yes, anytime you are back on the Pewter Moon.
If you can't pick up the cheese or throw the switch in the dungeon, you could try going out and coming back in. Otherwise, reboot Poptropica in your browser. You can't complete the island without doing this.