Olbers' Paradox
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
If the universe is infinite, eternal, and filled with stars, then no matter which direction you look in the sky, your line of sight will eventually land on a star. Therefore, the night sky should be as bright as day. But the night sky is dark. This proves that the universe is either not infinite or not eternal (it has a beginning). -
SCAFFOLDING EFFECT
Reduce cognitive load
Simple facts derive grand truths. - Merely through the fact that 'the sky is dark,' known to every three-year-old, one can derive the Big Bang (a beginning) and the expansion of the universe (redshift dimming). This teaches us: the most profound truths often hide behind the most obvious common sense, only if you dare to delve into its logical contradictions.
Anchor fast decisions
If the universe were infinite, static, and uniformly filled with stars, any line of sight would eventually hit a star's surface, so the night sky should be fully bright; but it is actually dark, constituting a paradox. The mechanism is explained by the universe's finite age + expansion + redshift: distant light has not yet arrived or is stretched.
MINIMUM ACTION
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Olbers%27_paradoxverified
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