this post was submitted on 28 Sep 2025
522 points (98.3% liked)
Greentext
7195 readers
188 users here now
This is a place to share greentexts and witness the confounding life of Anon. If you're new to the Greentext community, think of it as a sort of zoo with Anon as the main attraction.
Be warned:
- Anon is often crazy.
- Anon is often depressed.
- Anon frequently shares thoughts that are immature, offensive, or incomprehensible.
If you find yourself getting angry (or god forbid, agreeing) with something Anon has said, you might be doing it wrong.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
the physics limit to the density of energy is literally a black hole. it compresses the maximum amount of mass (energy) into a space. but that's technologically useless since you can't extract the energy out of it on-demand.
The densest ways of storing energy that are technologically useful are:
There's also speculative technologies like antimatter (24 * 10^9 kWh/kg) which aren't available today.
Source
The beauty of using uranium as currency is that if anyone hoards too much of it, the problem takes care of itself.
So one gram of antimatter could power a modern city for like three months? That's wild.
There actually is a method that could be used to extract energy out of a black hole. Probably not something you'd build in a watch-sized device though.
it only seems to work for rotating black holes though?
Yeah, that's why you have to wind up your watch every now and then. To spin up its internal black hole again.
just drink more it'll start spinning soon enough
Don't they all spin though? As in any matter falls in one way or another angular momentum is gained.
It is possible, but very unlikely. Maybe two bh merge that has exactly opposite angular momentum.
If the well, event horrizon expands when a blackhole takes more mass, why can't we just figure out how much volume it is compressed into by measuring the event horrizon increase?
We know the matter that goes in is a certain size. Maybe we can deduce the total size it is compressed to? And the size the blackhole gains.
It's impossible to know based on the current understanding of particle physics. A black hole is formed when the inward gravitational force exceeds the outward neutron degeneracy pressure of a sufficiently massive object, which is what keeps neutrons from occupying the same space (not really, it's complicated). Beyond that, only conjecture exists with no evidence, and the information paradox makes it impossible to observe the space inside the event horizon.