That means that our universe today, roughly 13.7 billion years after the bounce, would share many of the same properties of the pre-bounce universe at 13.7 billion years before the bounce. In a sense, our universe has a mirror image of itself, with the Big Bang (or bounce) as the line of symmetry.
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So, after figuring out that the Universe is going to expand forever, they figure that maybe there was something called a bounce, and there was actually before, and we're connected to our identical twin, and we might have a collapse after all?
[head asplodes]
You understand it perfectly! Class dismissed!
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