The key? The mean temperature of the Universe was more than 2 million Kelvin… Tiny messengers with information about the early universe, known as neutrinos, that have passed freely through the detritus of the universe since the very beginning. When the Universe was one year old, it was much hotter and denser than it is now. a few billion degrees kelvin, maybe 10 billion K. This is called the hadron era, when the universe's age was between 0.1 … The universe was born with the Big Bang as an unimaginably hot, dense point. The mean temperature of the Universe was more than 2 million Kelvin… When the Universe was one year old, it was much hotter and denser than it is now. The PTOLEMY project, based at Princeton University, explores the origins of the universe less than a second after the Big Bang. The temperature was only (!) Scientists hope to discover the link between quantum and classical physics, which will give us a lot more information about how the universe works. This homogenous area of the universe spanned a region of only 1 x 10 -33 centimeters (3.9 x 10 -34 inches). At t = 1 x 10 -43 seconds, the universe was incredibly small, dense and hot.
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