Final answer:
The question explores the multiverse and anthropic principle in physics, considering an infinite, eternal reality that could solve the problem of infinite regress and explain the tailored physical laws of our universe.
Step-by-step explanation:
The question broaches the concept of the multiverse, an idea within the realm of physics and cosmology that posits the existence of many universes, each with its own set of physical laws. This notion supports the argument that our universe's physical laws are as they are because this is the only scenario in which we would be able to exist to ponder them - the anthropic principle. The idea of an infinite and eternal reality addresses the philosophical conundrum of infinite regress by suggesting all time occurs simultaneously, making every moment always present, thus there is no 'before' the universe.
Testing these theories is challenging due to the inability to interact with alternate universes, making some of these discussions border on the philosophical and metaphysical. Still, the anthropic principle and the multiverse theory provide ways to consider our presence and the tailored laws of our cosmos. If everything and all time always exist, then there would be no beginning or end, and thus the question of what came before or will come after becomes inherently meaningless.