Toasty Ermine
Ok i think that the light signifies a single even happening that is somehow drawing the null chamber planet to us (whether it has a conscience or not) that event could probly be that big explosion (the one that resulted in the crater) or it could be us kicking a** with zOMG! rings.
Actually , the crater creation is explained in the manga. WHat isnt explained is how they came about with the ring technology . Or how they were able to harness the null crystals.
2-Dtitan
6. Although the Null crystal planet in space is not the one we go to. If so how do we breathe? How does it produce oxygen?
I think that the lager crystal in space
IS the one we go to. But we teleport to the inside of it . And on the inside there is an atmosphere. OR, while inside the null chamber we aren't really in a physical form but in an energy form. Which would explain the energy trails coming and going in that picture (and not needing to breathe in space). Those are probably Gaians comeing and going to the null chamber.