The Triune Universe (Time, Space, and Matter) (ICR.ORG ) Nature Reveals God's Triune Nature. The common phenomena of universal experience are always related to just three—and only three—physical entities. The perspective of modern science is clearly that of the universe as a time-space-matter continuum, with each of the three entities essentially indistinguishable from and coterminous with the other two.
There is an immeasurably and unimaginably huge universe out there (even though the most important part of it appears to be here). The physical universe is "temporal"—its physical characteristics are defined qualitatively and quantitatively in and by time, space, and mass/energy (usually abbreviated as just "matter").
Any effort to determine the cause of the universe is purely hypothetical. No human was there to observe the processes, so any attempt to understand events of pre-history (especially original events) must, therefore, be based on "belief systems," or presuppositions. While the theories and ideas may be many, the presuppositions can only be of two sorts: 1) there is an infinite series of causes, going back into infinite time, with no ultimate Cause; or 2) there exists an uncaused First Cause that was "outside" or transcendent to the universe.
Many scientists today conduct their research based on their presupposition or belief that nothing exists beyond the natural world—that which can be seen around us—and thus they do not accept that any ultimate Cause exists.
The "uncaused First Cause" is the Creator who exists outside of the physical creation He made. Time is not eternal, but created. To ask what happened in time before time was created is to create a false paradox without meaning. There was no "before" prior to the creation of the triune universe of time, space, and mass/energy.
Yet even more amazing (and the universe is amazing) is the historic fact that the Creator-God, after purposefully creating the time-space-matter universe, chose to enter it in the God-human person of Jesus Christ—for the sole purpose of providing a means by which humanity could have a personal relationship with the Creator.
"And the Word was made flesh, and dwelt among us, (and we beheld his glory, the glory as of the only begotten of the Father,) full of grace and truth” (John 1:14).