This thing is -270°C and is EVERYWHERE

The video explores the cosmic microwave background (CMB), a signal from the early universe discovered by accident in the 1960s. It explains the CMB's origins, its significance in understanding the Big Bang, and how it provides insights into the universe's expansion and dark energy. The video also covers the early universe's conditions, the recombination epoch, and how the CMB has been mapped using space probes.

How does the expansion of the universe affect the wavelength of the CMB?

Discuss the role of the Sunyaev-Zel'dovich effect in understanding dark energy.

What evidence does the CMB provide regarding the Big Bang theory?