I have a world I want to put together but I ran into a problem.
This world is a cube infinite in all directions, exactly half of it is full of earth and half is space (where we see normal space stuff happening besides a place that makes the special "Suns" required for this world but I'll get to that in a second). The world has a fairly strong magnetic field for the purpose of supporting the "Suns" that light this world. The "Suns" are big, flat, flaming disks that (due to their composition) flare up and down every few hours to create a rather ugly day/night cycle. The last thing I know: life (in this world) is brought about from this magic, gold, sparkly dust. The more you have, the smarter you are.
Gravity. Of course I could hand-wave this but I would like to make it at least a little realistic. From what I have now the infinite mass would end up collapsing in on itself and killing everything. Is there a way around this? I was thinking something along the lines of massive, complex cave systems or low density soil. Would any of these ideas work or is my world doomed to self destruction?
If you need any clarification on any thing, let me know and I will be mor than happy to tell you what I can.
EDIT: oops forgot something important. Unlike the world in This question: Gravity on a Minecraftian world? I want the world to go all the way down to the end of infinity. Gives me a little more space to work with.