Finite Age of the Universe
The finite age of the universe is the cosmological conclusion that the universe had a beginning (the Big Bang) and has existed for a finite duration (~13.8 billion years). This concept resolves several observational paradoxes that arise from assuming an infinite, static universe.
Key Implications
- Resolution of Olbers’ Paradox: The darkness of the night sky is explained by the finite age of the universe combined with the finite speed of light. We can only observe light from stars within our observable universe, as light from more distant sources has not had sufficient time to reach us.
- Cosmological Horizon: There is a limit to how far we can see, defined by the particle horizon.
- Evolution of the Universe: The universe changes over time (expansion, cooling, structure formation), contradicting the Steady State model.
Related Concepts
- olbers-paradox: The apparent contradiction that an infinite, static universe should have a bright night sky.
- Observable Universe: The spherical region of the universe comprising all matter that can be observed from Earth at the present time.
- Speed of Light: The finite speed () that limits the propagation of information and light.
- Big Bang: The prevailing cosmological model for the observable universe’s early development.