You have to replace the fuel rod and get some better coordinates.
(see related questions below)
Yes, anytime you are back on the Pewter Moon.
You can't get to Jungle planet without a spaceship. You can make a spaceship at the moon.
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.
You will use the saucer Excalibur to reach space, then build a spaceship on the Pewter Moon. (see related questions for how)
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)
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.
go to the moon and there will be a building ask the owner wether you can costumize your space ship good luck
Enter the coordinates of the Pewter Moon (X-56 Y-52) on the dials. The planets that the Queen told you about are too far away. Once you reach the moon, you can get a spaceship to take you to them.
You can reach space by fixing the crashed saucer Excalibur, and get a new spaceship at the Pewter Moon. (see related questions)
"Space" in Poptropica is in Astro-Knights Island. You must complete the section of the island on Earth, which enables you to travel to the moon. You can build a spaceship there and travel throughout space!! Have fun!!
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)
When you are in the spaceship (solar system) view, click on the moon or planet you want to land on. To leave again, use the "launch" lever.