Picture of the Big Bang (a.k.a. Oldest Light in the Universe)

The video explains cosmic background radiation, originating from the Big Bang, and its journey through the universe. It describes how the universe's expansion led to the formation of hydrogen atoms, making the universe transparent. The cosmic microwave background radiation (CMB) is a remnant of this early universe, providing insights into the temperature and structure of space. Quantum fluctuations in the early universe led to the formation of galaxies and other cosmic structures.

What is the cosmic background radiation and why is it significant?

Describe the conditions of the universe just after the Big Bang.

How did the universe become transparent to light?

What does the temperature of the cosmic microwave background radiation tell us about the universe?

Explain the significance of the small fluctuations in temperature and density in the early universe.