What was it like when no stars yet existed?
<p>When it comes to our cosmic history, it’s incredible to realize how impactful the earliest moments were in creating the conditions that would allow for our very existence many billions of years later. The earliest stages we can say anything meaningful about actually occurred even prior to the start of the hot Big Bang. Cosmic inflation took place and then ended, seeding the Universe with quantum fluctuations and then giving rise to the hot Big Bang. The Universe cooled and expanded from its hottest, densest stages to produce more matter than antimatter, then stable protons and neutrons, then atomic nuclei, and eventually even neutral atoms, all amidst a background sea of radiation and neutrinos.</p>
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