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The Sleepy History of the Universe

Get Sleepy: Sleep meditation and stories

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The Cosmic Background Radiation

In the early universe, even light and matter hadn't been separate. At this point though, a few hundred thousands of years into the history of the universe, they finally became decoupled. Our telescopes today can still pick up that earliest light, drifting to us across the vast distances of space. Over time, that first light has cooled into microwave radiation. Scientists call it the cosmic background radiation. This radiation gives us important clues about the early universe; its powerful evidence to support the theory of the Big Bang.

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