The Cosmic Afterglow
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[MUSIC] (sound of static) In 2009, when television converted to digital broadcast, the beginning of the universe went off the air. A small amount of the crackling static on an old TV was radiation from the universe’s youngest days. In the first few seconds after the Big Bang, the universe was a sea of free electrons and atomic nuclei, so unbelievably hot and dense that not even photons could escape that opaque cosmic pinball machine. Eventually, a few hundred thousand years later, things spread out and got cool enough that neutral atoms could form, and the first light finally went streaming out in every direction. For a while, like a-few-hundred-million-years-while, those first photons were the only light in the universe, until early atoms condensed to ...
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[MUSIC] (sound of static) In 2009, when television converted to digital broadcast, the beginning of the universe went off the air. A small amount of the crackling static on an old TV was radiation from the universe’s youngest days. In the first few seconds after the Big Bang, the universe was a sea of free electrons and atomic nuclei, so unbelievably hot and dense that not even photons could escape that opaque cosmic pinball machine. Eventually, a few hundred thousand years later, things spread out and got cool enough that neutral atoms could form, and the first light finally went streaming out in every direction. For a while, like a-few-hundred-million-years-while, those first photons were the only light in the universe, until early atoms condensed to ...
