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Science & Technology
The oldest light
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Timeline of the history of the universe according to Standard Model of Cosmology.

THE Cosmic Microwave Background (CMB) is the leftover radiation from the Big Bang. According to the Big Bang model, the universe began about 14 billion years ago as an extremely hot, dense plasma of particles (mostly protons, neutrons and electrons) and photons (light) occupying a space of a few millimetres across. The theory also tells us that the universe has been expanding from the instant it was born. From this extraordinarily dense state it has expanded into the vast and much cooler cosmos that we see today.

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