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Each theory presents different implications for the universe's fate and structure.
Proposed around 13.8 billion years ago, the universe began from a singularity, expanding rapidly. It suggests an evolving universe with observable evidence like cosmic microwave background radiation and the redshift of galaxies, indicating ongoing expansion.
This theory posits that the universe is eternal and unchanging in density, with new matter continuously created as it expands. It maintains that the universe looks the same at all times, countering the Big Bang's notion of a singular origin.
The Oscillating Theory suggests the universe undergoes infinite cycles of expansion and contraction. After reaching a maximum size, it collapses back into a singularity, leading to another Big Bang, thus creating a cyclical universe.