CMBR is everywhere at a temperature of about -270°C. CMBR is the remains of the heat energy from the Big Bang, spread thinly across the whole Universe. Does evidence support the Big Bang theory?

CMBR has a wavelength of about 2 mm. in the 1960s. The wavelength of this radiation appears to be the same no matter where in space that it comes from and it corresponds to a temperature of about ...