The Origins of the Universe

Everything we've talked about so far happened within the first seconds of the universe's existence. And as more seconds passed, the cosmos kept expanding and cooling and more early particles of matter coalesced. Until finally, possibly around 3 minutes into the life of the universe, the cosmos had cooled to perhaps a bit less than 2 billion degrees Fahrenheit. At that point, the coalescing protons and neutrons could start joining to form the next level of complexity in the development of matter as we know it.

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