depends on where u are. if u have a ship already, it should be on the castle somewhere on the roof. if you don't have a ship yet, watch a you tube video.it really helps!!!!!!!!
To see the solar system on Astro Knights island, go to the Planetarium. (not part of the game, but an interesting view)
This means you have already completed the Arturus part of Astro Knights Island. Your spaceship should be parked on top of the castle if you return to the planet.
Only by telling you how. (see the related question)
You start at the far left of Astro-Knights Island (look at the map). Go all the way to the right on the main street. You should be at the castle. Go right again. You should come to the mill. Note: To move, make sure the arrow is blue, and click to walk or run.
There is one in the middle (upper part) of the spaceship fountain next to the Mordred Museum.
If you are talking about the one in astro knights island, just push on the part that is blocking the sort of hallway and it will eventually cave in.
In the undergroud part of the libary
On Astro Knights Island, the part of the quest that occurs on the planet Poptropica is in the kingdom of Arturus. The kingdom was attacked by robot invaders who have kidnapped the Princess.
she is on astro knights iland in space
The GOLD COIN is in the fountain next to the Mordred Museum. It is the sparkle in the water in the middle of the water part of the fountain. Use it to pay admission to the Museum.
The coin is in the fountain in Astro-Knights. You need to use the crystal to remove the coin from the fountain.
In the musaemyou go to the top part were the bed is duck and you will get a note