Black holes the size of an atom that contain the mass of an asteroid may fly through the inner solar system about once a decade, scientists say. Theoretically created just after the big bang, these examples of so-called primordial black holes could explain the missing dark matter thought to dominate our universe. And if they sneak by the moon or Mars, scientists should be able to detect them, a new study shows.
If dark matter is fully explained by such black holes, their most likely mass, according to some theories, would range from 1017 to 1023 grams—or about that of a large asteroid.
In case this doesn’t tell you a lot, 1017 grams is half the weight of Mount Everest, and 1023 grams is 4x the weight of the Antarctic ice shield.
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One, if it was a football stadium the size of Mount Everest.
I can only do Olympic swimming pools or bananas.
I thought these were disproved by lack of gravitational microlensing?
The main way you’d see that kind of microlensing is if they aggregated.
But given the way gravity works, they should aggregate, otherwise why call them black holes?
If they were relatively evenly distributed would that counteract lensing?
Yes, it would just be surprising because, gravity should make them not be evenly distributed.
The whole thing with dark matter is that it’s this magic stuff that causes gravity but isn’t affected by it, which… is not how gravity normally works.
Though there is still room for it, we just need a better framework other than “I added 3 and 5 and got 12, so obviously I must mean to add 3 and 5 and 4 too”.
You’re mistaken. Dark matter, whatever it is, isn’t affected by anything except gravity. It interacts with gravity just like “normal” matter.
The evidence is also significantly better than you’re describing
Then it should also coelescce, particularly since it doesn’t have the em force to keep it repelled, the universe should be dominated by massive dark matter black holes.
Yes, there’s math that explains part of the distribution, but also there is 0 force opposing any collapse we’d have a lot more neutron stars and other degenerate matter catalyzed by dark matter.
We have hypotheses like this when our observations don’t make sense and we need to explain them, it’s definitely a possibility but we still have room to understand the large scale physics at play.
You don’t need a force to prevent collapse if there’s no drag force to slow things down. It would actually be almost impossible for a cloud of dark matter to collapse since any individual particle has momentum and no way to slow down, so they’ll all be in some sort of mutual orbit
I’m guessing you’ve seen as many lorentz attractor simulations as I have, what always happens is something like tidal effects or angular momentum means 90% slow down while a few particles get shot out of hell at ludicrous speed.
The effect is similar to drag, and is basically how we get entropy even without em effects.
Cool, one more thing to keep me up at night
And one more… https://www.williamflew.com/blue.html
What would happen if one of these tiny black holes hit Earth? The article doesn’t really talk about it.
Absolutely nothing.
Also not sure why they wouldn’t evaporate nearly instantaneously. Sounds to me like more dark matter bunk.
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Passing near the earth, we’d get some strange tides. Passing through the earth, it would eat earth.
Nonsense. The event horizon on such things is incredibly small, as is the mass vs. that of Earth.
You don’t need the event horizon, you just need local gravity around 1G. For the masses described in the article, that radius is from hundreds of meters to 10s of kilometers.
Which still wouldn’t do what you suggest. The mass is the same, so it has the same effect from a distance. Unless by “eat earth” you meant it would take in dirt until it suck to the core, still about the same mass.
The book, Seven Eves is about one of these hitting the moon.
The cause of the incident is never specified in the book.
The book Earth by David Brin is about one of these hitting the Earth
Would a regular asteroid be able to wobble the earth as described in this article? Or is it just black holes that should do so?
I seem to remember reading that primordial black holes weren’t yet a proven phenomenon and I have trouble imagining them myself. Wouldn’t they have hawking radiation too which we would be able to detect?
What if dark matter is some form of black hole or exotic ultra dense material made entirely out of the missing antimatter, which for whatever reason doesn’t otherwise interact with electromagnetism? 2 birds, 1 stone.
