Why is it Dark at Night?

What would the night sky look like if the universe were infinite, eternal, and uniformly filled with stars?

• Completely dark, with only a few visible stars.

• As bright as the surface of the Sun.

• Filled with swirling nebulae and gas clouds.

• Constantly changing with new stars appearing and old ones fading.

How does the finite age of the universe contribute to the darkness of the night sky?

• It causes stars to burn out quickly.

• It means light from the most distant stars hasn't had enough time to reach us.

• It limits the total number of stars in existence.

• It prevents the formation of very large galaxies.

When astronomers observe light from 13.5 billion years ago, what are they essentially seeing?

• The universe as it is today, but from a different angle.

• The universe before any stars had formed.

• A future version of the universe.

• A region of space with an unusually high density of stars.

What is the primary reason that light from extremely distant stars and the cosmic background radiation does not appear bright to our eyes?

• The light is absorbed by interstellar dust.

• The light is too faint to be detected by human eyes.

• The expansion of the universe causes the light to redshift into the infrared spectrum.

• The stars are too small to emit visible light.