This is Minecraft, not necessarily earth, and so i think instead of planets in the solar system, it should be planets in the Minecraftia system.
you just blew my mindI didn't add this, but a world that is almost all rock on the side facing away form the sun, and has little pools of lava, and on the side facing the sun, it would be uber-hot, and would have volcanoes and lava explosions, and would rotate like the moon, so only one side would face the sun. Then you could craft a lava-surfboard and surf the volcanoes and erupting lava.