The FIRE PLANET is at coordinates X-83 Y-20, up and to the right from the planet Poptropica.
The Fire Planet is at coordinates X-83 Y-20, up and right from the Pewter Moon.
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.
The lava is the first challenge on the Fire Planet (X-83 Y-20), which is up and to the right of the planet Poptropica. (see related question)
you need to defeat the dragon
The FIRE PLANET appears red and smoking from orbit. You will find it at X-83 Y-20.
The FIRE PLANET is one of the three planets that the Queen gave you the coordinates to, and it is at X-83 Y-20 (up and to the right from the planet Poptropica).
On the lava geysers of the Fire Planet, you will need to jump from the 5th to the 6th rock platforms when they are BOTH moving DOWN. (You will land on the rock as it is falling under you.)
On the Fire planet, cross the lava rocks by jumping when the next rock is lower. For the 5th and 6th rocks, jump when both rocks are moving downward, so that the rock falls under you.
On Astro Knights Island, you wait for a platform to come down to a level so that you can jump onto it. However, the 6th platform never gets lower than the 5th, so you should jump when both platforms are moving rapidly down. The 6th platform should fall right under you.
The game designers are making the player think, which makes Astro Knights harder than the previous games. Unlike the first five jumps over the lava, the 6th jump appears impossible, until you jump while BOTH platforms are moving DOWN.
On the Fire Planet, you have to jump to the rocks on the lava geysers. On your 4th jump, the next rock is out of sight when you jump, so just make sure it is below you. On the tricky 6th jump, jump when BOTH rocks are heading DOWNWARD.
Just wait until the 5th and 6th lava rocks are both moving downward, then jump. The sixth rock should fall right under you.