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 is Olber's Paradox primarily concerned with?

• The darkness of the night sky

• The size of the universe

• The brightness of the sun

• The color of the stars

Which assumption about the universe is challenged to resolve Olber's Paradox?

• The universe is static and unchanging

• The universe is finite

• The universe is filled with dust

• The universe is made of antimatter

What event marks the beginning of the observable universe?

• The first supernova

• The creation of the Milky Way

• The Big Bang

• The formation of the first star

Why can't we see the entire universe?

• Galaxies block our view

• Stars are too dim

• The universe is too small

• Light takes time to travel, limiting our view

What is the cosmic microwave background?

• Infrared light from nearby galaxies

• Visible light from distant stars

• Remnant light from the early universe

• Radio waves from black holes