The Olbers' Paradox is a famous problem in astronomy and cosmology that addresses the question of why the night sky is dark if the universe is infinite and filled with an infinite number of stars. The paradox is named after the German astronomer Heinrich Wilhelm Olbers, who discussed it in the early 19th century, although the problem was considered by earlier astronomers as well.
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Cosmic Background Radiation, often referred to as the Cosmic Microwave Background (CMB), is a form of electromagnetic radiation that fills the universe and is a key piece of evidence supporting the Big Bang theory of the universe's origin. Here are the fundamental aspects of Cosmic Background Radiation: