On Monday, November 11, 2019 at 8:36:35 PM UTC-6, Alan Grayson wrote: > > I'm watching a science channel about the BB. It's claimed that in the VERY > early universe, a few seconds after the BB, it was so HOT that Hydrogen was > fusing into Helium. BUT ... I thought Hydrogen didn't form until around > 380,000 years AFTER the BB, when the CMBR formed. What's going on? TIA, AG >
You are thinking of hydrogen atoms. After the first three minutes, when EW was unified, there was a 20 minute period where temperatures permitted p + p --> D + e^ + neutrino. These could fuse into He_2^4. A quarter of all protons fused into alpha nuclei. This was predicted and supports BB. The temperature of universe was billions to hundreds of millions K. Interesting that mush fusion happened that quickly. It was later when temperatures dropped below 10,000K or so that hydrogen and helium atoms formed. LC -- You received this message because you are subscribed to the Google Groups "Everything List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/everything-list/796a1943-ae52-487d-960b-764a10c7b9ee%40googlegroups.com.
