There is no way we will ever be able to fully understand our physical universe. We will never know when it was created and we will never know how fast it is expanding. The Bible said that humans will never be able to comprehend how vast the universe is and that everything will be ultimately destroyed at the end of God's timetable for humans. If accurate, this would mean our entire universe is destroyed along with Earth.
Taking the agnostic viewpoint, our universe is just one set of countless other universes that could be linked together. Ours is just a reaction that is still occurring. We are too primitive to travel to other solar systems or galaxies and the ill fate of our Earth will probably be decided before we can accomplish such feats.
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