You hop on the lava spouts (jump from 5th to 6th while both are headed downward). Once on the last one go onto the volcano. Then climb down to the snake while avoiding the yellow air currents. Then hop over the snake and defeat the dragon by shooting an ice arrow into its mouth.
(detailed solution at the related question)
There are no cubes on Astro Knights island. There are ice floes on the Ice Planet, that you jump across to avoid the robot fish.
Astro Knights
The phoenix is on the jungle planet
the jungle planet is in space on astro knights island.
Green.
The Laser Lance.
No. Although there is a red planet, it is the Fire Planet and is not intended to be Mars.
go to ice or fire planet but fire is the hardest
In order to get to the lava planet on Poptropica's Astro Knights, you must fly to the sun. From there, you must fly diagonally in the right direction. You should come across the lava planet.
It is on the Fire Planet. The Fire Planet's coordinates are 83, 20.
You do not get or use a bucket on Astro Knights Island.
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.