Which of these assumptions must be incorrect, according to the resolution to Olbers' paradox?
Answer
The universe is infinitely old
The resolution relies on modern cosmology, specifically pointing out that one or more initial assumptions must be wrong. The finite age of the universe (beginning 13.8 billion years ago) is a key factor preventing light from infinitely distant sources from reaching us.

#Videos
Why is it Dark at Night?
Related Questions
What causes the sensation of darkness that settles upon us each evening?What is the question posed by Olbers' paradox?Which of these assumptions must be incorrect, according to the resolution to Olbers' paradox?What is the cosmological factor that causes light from very distant galaxies to shift toward the red end of the spectrum?What defines the boundary of the *observable* universe concerning the age limit factor?How does the expansion of the universe affect the light we receive from the most distant sources?What process makes the daytime sky appear blue?What is 'airglow' a natural source of residual light in the night sky?What is the primary factor that dramatically reduces the depth of darkness experienced by people in populated areas?What observation would be true if one were floating in space beyond Earth's atmosphere at night?What physical consequence would occur if the Earth were tidally locked with the Sun?