![]() It was first predicted by Ralph Alpher and other scientists in 1948 but was found only by accident almost 20 years later. Sometimes called the "afterglow" of the Big Bang, this light is more properly known as the cosmic microwave background (CMB). This allowed light to finally shine through, about 380,000 years after the Big Bang. ![]() ![]() Over time, however, these free electrons met up with nuclei and created neutral atoms or atoms with equal positive and negative electric charges. "The free electrons would have caused light (photons) to scatter the way sunlight scatters from the water droplets in clouds," NASA stated. This early "soup" would have been impossible to actually see because it couldn't hold visible light. The cosmos now contained a vast array of fundamental particles such as neutrons, electrons and protons - the raw materials that would become the building blocks for everything that exists today. This all happened within just the first second after the universe began, when the temperature of everything was still insanely hot, at about 10 billion degrees Fahrenheit (5.5 billion Celsius), according to NASA. Hubble images show the far-distant galaxy GN-z11 as it appeared shortly after the Big Bang.
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