If all these different kinds of universes truly existed, then there must be things capable of traversing between universes. After all, this universe already contained tachyons, something that should belong to the Tachyon Universe. Didn't that mean tachyons had crossed over from the Tachyon Universe into this one?
Negative Energy and Negative Matter were the same.
Occam's Razor Theory said: do not multiply entities beyond necessity.
Since a normal universe already had theories explaining these things, there was no need to introduce theories of other universes. Besides, what was the universe? Shi Jiao said, "All directions above and below are called space; all times past and present are called time."
The very word "universe" already encompassed everything. So even if there were other so-called universes, they were actually still part of one universe.
Over the following period, Yue Yuan spoke with Zheng Jiuyuan at length. His meaning was clear: humanity had to embark on a voyage and search for Natural Wormholes. Only then could they determine which theories were right and which were wrong.
But the most frightening thing about such a voyage was the possibility of finding nothing. If humanity could never find one, it would never be able to falsify one of those propositions. They might end up forever unable to find the path to becoming a Level 5 Civilization.
There would be no solution.
It was like the existence of ghosts and gods. Since no one could prove anything, it came down to whose system of gods and Buddhas sounded more reasonable. There was no way to verify it anyway.
But if they did not embark on a voyage to search for Natural Wormholes, what if the Theory of Everything needed to advance to a Level 5 Civilization really was hidden within those strange cosmic phenomena?
Thinking