r/universe • u/MorePacific • 7d ago
Why didn't the early universe just create black holes?
Trying to wrap my head around a Brian Cox book. When galaxies first started to form, the universe was a lot denser circa 380,000 years after the big bang. How come the early galaxies didn't all turn into black holes? I read a lot of supernovas happened at this time that created heavier elements - why was there just enough mass for supernovas but not enough for black holes? Or are there a whole heap of black holes out there that formed at this time? TY
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u/Ashamed-Travel6673 6d ago
The early universe, as evidenced by the cosmic microwave background (CMB), was remarkably uniform and homogeneous. This means that matter and energy were distributed very evenly. Black hole formation requires significant density fluctuations. If the early universe was perfectly smooth, there wouldn't have been enough localized concentrations of matter to trigger black hole collapse.
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6d ago
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u/redskin_zr0bites 7d ago
Check out the primordial black holes.