Judging from the picture above, it is true that "Universe created after cooling (Big Explosive) from Big Bang", Means the Universe will DIE for onedays When the heat source running Low. Sejuk mengecup. Like pepejal, each zarah compress very close to each other, when it hit the heat source, it begin to melt down. The form may expanding to gas. In between the zarah of gas, a "space" created. Is this can call The "space" in universe, & our planet just an a unit zarah or maybe less than that.    

The Universe may again RE-compress to the original form of energy (i imagine it as a small energy ball like atom). Compression & depression. Based on AKIRA anime 1988.