you fly to a large asteroid in the asteroid belt and land there. that is the crystal gate when you climb to the top
The Crystal Gate is an asteroidat the coordinates 11,18Full walkthrough athttp://poptropicasecrets.com/walkthrough/poptropica-astro-knights-walkthrough/
its impossible i don't know so try on your on sucker.ha ha
The coordinates are X 11, Y 82
Once the Golden Key and the Green Orb are returned to Arturus, there is no way to open the crystal gate.
There is no way into the cell from the library. Throwing the switch opens the "back gate" to the cell, which you can access from Mordred's underground laboratory. (see related question)
There doesn't seem to be a drain there. There's a robot owl, who will follow you if you feed him a mouse. There's a dirt wall you can push through, and a tunnel to the dungeon where the robot attacker is kept. The gate at the end is opened from the library entrance to the dungeon.
To draw the sword from the crystal stone, you must have defeated all three planets (jungle, ice, and fire) and have all three knights with you. (see the related questions)
The small gate is in the BACK of the dungeon cell, and connects to the tunnel Mordred dug. By throwing the dungeon switch, you open the gate so you can come in that way. (see related question : getting back in the dungeon)
The switch in the dungeon (the library entrance) opens the little gate in back of the cell. That's how you get into the cell. The tunnel leads to Mordred's secret underground laboratory, and you'll need a key to get in there.
Feed the mouse to Merlin, the mechanical owl, and he will follow you into the cell. Click Merlin, then the vial, and he will retrieve the fuel rod for you.
Go back down and pull it. You need the gate open to reach the cell. (see the related question)
Back Gate to the Dungeon CellThe front entrance to the dungeon cell does not open. Throwing the switch opens the rear gate, which is accessed from Mordred's secret laboratory.The Golden Key and the Portal GateYou need all three knights with you to pull the Golden Key from the Crystal. This means beating all three planets.(see related questions)