Cosmic Origins: When Did the First Stars Form? - The Debrief

Stars could not have existed in the early universe because the extreme heat would have dispersed them. So when did the first stars form?

The Universe had been expanding for 13.8 billion years. But in the first few minutes, it was hotter and denser than the core of the Sun. We know it from the observed abundances of light elements, suc… [+6764 chars]

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