Timbosconsin t1_it4uph3 wrote
Reply to comment by Hexum311add in China’s FAST telescope finds biggest atomic cloud ever discovered by tommos
They wrote in their nature article that the ‘cloud’ is either from tidal interactions between existing members in the galaxy group or from another galaxy approaching the galaxy group. Both explanations deal with extended diffuse atomic hydrogen from existing systems increasing in density from tidal interactions between galaxy group members and/or interactions with an external galaxy well after the Big Bang.
So not a protogalaxy cloud as you described. Most likely existing HI gas from members or another incoming galaxy.
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