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JWST Spots Giant Black Holes All Over the Early Universe
(www.quantamagazine.org)
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this post was submitted on 18 Aug 2023
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The things we see are from a millions years ago, who knows where or how big these are right now, might not even exist any more.
*Billions (13,000+ million). Based on our current understanding and their close proximity to each other in the early universe, most of them would have likely merged and many/most may be now at a size where it would take a google years to evaporate. The extremely small ones that did not merge may have already evaporated.
Source: Hawking radiation
From my understanding they would still have a looong way to go before they would have evaporated.
I thought so too but apparently the length of time it takes a black hole to evaporate is based on mass and those with a low mass โ as in, the mass of the moon โ should have already evaporated. Only supermassive black holes are the ones likely to take a google years to evaporate.
Edit: none of the ones pictured are that small. We probably couldn't detect them for hundreds/thousands of years (e.g. until solar system sized telescopes).
According to this calculator a black hole the size of the moon would take 584,745,000,000,000,000,000,000,000,000,000,000,000,000,000 years. I'm always open to correction though. (5.84745E44)