Why Is the Night Sky Dark?

The video explores Olber's Paradox, questioning why the night sky is dark if the universe is infinite. It discusses historical explanations, such as dust clouds, and resolves the paradox by considering the universe's expansion and the finite lifespan of stars. The video explains that the observable universe is finite due to the Big Bang and light travel time. It introduces the cosmic microwave background as evidence of the universe's past brightness. The video concludes by acknowledging supporters and promoting further engagement.

What new insight or understanding did you gain from this video?