In trying to understand the nature of the cosmos, some theorists propose that the universe expands and contracts in endless cycles.
Because this behavior is hypothesized to be perpetual, the universe should have no beginning and no end—only eternal cycles of growing and shrinking that extend forever into the future, and forever into the past.
It’s an appealing concept in part because it removes the need for a state called a singularity that corresponds to “beginning of time” in other models.
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