The CMB is the remnant radiation of the Big Bang, the oldest light in the universe, and evidence for the expansion of the universe.

The CMB has a temperature of 2.725 Kelvin, which is very close to absolute zero (-273.15 °C).

The CMB provides evidence for the Big Bang theory, allows us to study the early universe, and helps us understand the evolution of galaxies.

The CMB is composed of photons, which are particles of light.

The polarization of the CMB is the alignment of the electric field of the photons.

The temperature anisotropy of the CMB is the variation in temperature of the CMB across the sky.

The temperature anisotropy of the CMB provides evidence for the Big Bang theory, allows us to study the early universe, and helps us understand the evolution of galaxies.

The cosmic microwave background radiation is the leftover radiation from the Big Bang, which is the event that created the universe.

The temperature of the cosmic microwave background radiation is 2.725 Kelvin, which is very close to absolute zero (-273.15 °C).

The cosmic microwave background radiation provides evidence for the Big Bang theory, allows us to study the early universe, and helps us understand the evolution of galaxies.

The polarization of the cosmic microwave background radiation is the alignment of the electric field of the photons.

The temperature anisotropy of the cosmic microwave background radiation is the variation in temperature of the CMB across the sky.

The temperature anisotropy of the cosmic microwave background radiation provides evidence for the Big Bang theory, allows us to study the early universe, and helps us understand the evolution of galaxies.

The Cosmic Background Explorer (COBE), the Wilkinson Microwave Anisotropy Probe (WMAP), and the Planck satellite are some of the instruments that have been used to study the cosmic microwave background radiation.

The faintness of the radiation, the presence of foreground contamination, and the difficulty in separating the CMB from other sources of radiation are some of the challenges in studying the cosmic microwave background radiation.