The cosmic background radiation corresponds to a blackbody at a temperature of 2.726 kelvins.

Question

Quizplus · Accepted Answer

This is true. The cosmic background radiation has been measured to have a temperature of approximately 2.726 kelvins, which matches the predicted temperature of a blackbody with the same spectral shape. This radiation is a remnant of the Big Bang and is an important source of information about the early Universe.

The Cosmic Background Radiation Corresponds to a Blackbody at a Temperature