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1 The Universe is 13.82 billion years old. 2  The Universe is expanding a bit slower than we expected. 3  The Universe is 4.9 percent normal matter, 26.8 percent dark matter, and 68.3 percent dark energy.  The Universe is lopsided. Just a bit, just a hint, but that has profound implications.
The universe is expanding and not at a known linear rate so that expansion value will change with time. Since the Universe is (for argument's sake, 15 billion years old, it has averaged a 3 billion light years (ly) expansion per billion years. You would first have to go to one edge to begin your journey. In that time the universe could have grown to 70 billion ly across.