In stating his paradox, olber expected the night sky to be bright and not dark as we see it because he thought that every line of sight should intersect a star in an infinite universe.
A paradox is a situation when a statement seems or opposed to common sense but is true.
Night sky must be bright and not dark is said by Olber. There are randomly scattered stars in the universe. He assumed that each and every light ray must cross the star to brighten it more and sky will look brighter at night.
His paradox is just a common sense but perhaps true.
Thus, in stating his paradox, olber expected the night sky to be bright and not dark as we see it because he thought that every line of sight should intersect a star in an infinite universe.
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