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

Curious Kids: what is cosmic microwave background radiation?

Radiation United States Big Bang Robert Wilson India

Yaroslav Vitkovskiy/Shutterstock

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 of the universe.

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