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Curious Kids: what is cosmic microwave background radiation?

By Christopher Pattison, Senior Research Associate at the Institute of Cosmology and Gravitation, University of Portsmouth

What is cosmic microwave background radiation? Did it happen after the Big Bang? – Sreehari, aged nine, Kerala State, India

The Cosmic Microwave Background (CMB for short), is light: the oldest and most distant light that we can see in the entire universe. It comes from soon after the Big Bang – which is considered to be the beginning…

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