What is beyond the observable universe? 

Another universe, and endless amounts of others.  

You do not exist in an objective reality. To comprehend the true nature of reality, it would be helpful not to view the universe as existing outside of yourself. The universe you perceive is your own individual creation, and someone else’s perception of the universe is their own individual creation, quite literally.

When you travel through dimensions or systems, the outer edge of one system blends into the outer edge of another system or dimensional packet of experience. By experience, I mean perception. The energy units that exist between systems are conscious and contain data from both systems.