<ul><li>The Cosmic Microwave Background (CMB) is the oldest light in the universe.</li><li>The CMB is a collection of many wavelengths of electromagnetic radiation.</li><li>After 380,000 years since the Big Bang, the universe cooled and became transparent, forming hydrogen atoms and giving rise to the CMB.</li><li>In 1965, Arno Penzias and Robert Wilson accidentally discovered the CMB, which earned them the Nobel Prize in Physics.</li></ul>

The oldest light of the universe- THE COSMIC MICROWAVE BACKGROUND

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