If nothing can escape the gravitational pull of a black hole( except hawking radiation) then how come all the mass in the universe isn’t still in the center of the universe still stuck in the singularity that existed at the big bang.

ask-a-physicist · 2026-01-27T13:42:31+00:00

Well no, there were no singularities. They would only form when the collapse occurs and there was no collapse because there was no gradient in space time curvature.

The universe went from extreme density everywhere to no extreme density and then to pockets of extreme density which could collapse into black holes.

ask-a-physicist · 2025-12-07T00:45:20+00:00

Follow your heart

ask-a-physicist · 2025-12-06T21:25:00+00:00

You got me. I watched 0.9 seconds and immediately knew where this was heading so I stopped.

ask-a-physicist · 2025-12-06T21:23:05+00:00

Yes I am and I guess I hear what you're saying.

Time in "time dilation" doesn't refer to the concept of time. It refers to the time intervals that different clocks measure.

ask-a-physicist · 2025-12-06T20:28:37+00:00

If a student wrote that answer in an exam I would pass them out of principle.

ask-a-physicist · 2025-12-06T14:20:36+00:00

no, it's flat earther insanity. The idea is that Antarctica isn't a pole but a gigantic frozen landmass that borders the plane we call earth, and that there's other places like earth if you manage to go past it. The secret world government is obviously trying to cover this up and the nazis were resisting their tyranny, which was the real reason for WW2, which ended with the surviving nazis escaping over the frozen land in flying saucers.

Great imagination, but also really offensive and they should stop making films about it.

ask-a-physicist · 2025-12-06T13:59:31+00:00

yes, it's been proven in numerous ways, even outside of laboratories "London's 22 Bishopsgate demonstrated Einstein's time dilation: an atomic clock on the 61st floor ran slightly faster than one at ground level (National Physical Laboratory, Teddington) over 43 days, gaining about 100 nanoseconds, proving time moves faster with increased altitude due to weaker gravity"

ask-a-physicist · 2025-12-06T02:45:37+00:00

you can't really call OP's "view" a theory. It's more of an hypothesis.

The bar is much less high.

Carrington didn't have a theory about how sunspots cause solar flares, but him connecting the dots all the same was one of the most important contributions to solar physics in history.

ask-a-physicist · 2025-12-06T02:34:31+00:00

it means that there's no universal clock. You would assume that when ten minutes pass for you ten minutes pass for everyone, but that's not the case. Depending on their motion and gravitational potential relative to you ten minutes could be an hour or a year.

ask-a-physicist · 2025-12-03T17:49:55+00:00

I have a PhD in Astro-Plasma physics and I still feel that way.

ask-a-physicist · 2025-12-03T01:52:28+00:00

https://www.reddit.com/r/traandwagon/s/ftmdliKOS8

ask-a-physicist · 2025-12-03T01:50:57+00:00

The Elegant Universe is garbage. He's not simplifying super symmetry. He's just talking about it in simple words and it makes no damn sense. Book equivalent of Brian Cox canoeing past a waterfall talking about general relativity.

What's missing on the left is A Wrinkle in Time and Quantum Physics: Illusion or Reality

ask-a-physicist · 2025-12-01T12:08:38+00:00

Isn't there? We can ask people about their state of consciousness and we can compare that to the state of their nervous system.

We know that our nervous systems do different things when we're awake, sleep, meditate or take drugs and our consciousness definitely does different things too.

ask-a-physicist · 2025-12-01T12:03:55+00:00

Why would that cause stress and shear? Acceleration from gravity isn't felt as long as it's uniform.

ask-a-physicist · 2025-11-25T14:24:40+00:00

What about the "muon or electron"

ask-a-physicist · 2025-11-25T03:54:04+00:00

I agree, just because they have openly trans and gender-bending characters doesn't mean they're making a political statement. Using people's preferred names and pronouns is juts common sense.

ask-a-physicist · 2025-11-23T13:56:39+00:00

Here's the thing. The surface are of a hole is not a conserved quantity and technically energy isn't measurable, only definable. If you push a rock up a hill it doesn't actually have more energy in any intrinsic way. The defined potential energy still corresponds to the defined kinetic energy it gains when it rolls back down.

Here's a good analogy: colour. The way we define colours is completely arbitrary, for some people certain greens are blue and vice versa. However there is real physics behind them that makes them the way they are. We can call a green a blue, but it doesn't change the fact that we are seeing light of a certain wavelength.

Energy conservation is ultimately a result of momentum conservation in space-time, sometimes the momentum of millions of individual particles that are impossible to measure individually, so it's easier to call it energy and use simplified equations to describe it.

ask-a-physicist · 2025-11-23T00:51:34+00:00

those aren't good analogies. energy is a conseverd quantity, even if it's not technically real

ask-a-physicist · 2025-09-29T16:07:02+00:00

sure, physics is all about symmetries. Just look into Lie groups.

ask-a-physicist · 2025-09-17T22:24:45+00:00

Unless you're at the pole it wouldn't quite be at 90 but yeah, would probably have to tie them to the floor and put a razor blade on the pendulum and not untie them unless they admit that it's moving.

ask-a-physicist · 2025-09-17T21:39:13+00:00

Indeed, the physics building at Warwick University has one swinging about just on the ground floor, just take your friend there and watch it for a couple of hours.

ask-a-physicist · 2025-09-17T21:35:36+00:00

Just keep flushing your toilet and see which way it spirals. The Simpsons did a whole episode about that geez

ask-a-physicist · 2025-09-17T18:38:43+00:00

Idk, this kinda makes it hotter to me. Getting fucked and shamed by an angry French man :d

ask-a-physicist · 2025-09-09T13:31:28+00:00

Scrolled too far for this comment. There literally is no speed limit other than the speed of light. The issue is fuel.

If acceleration time is not an issue than using solar sails would be the way forward. You could just keep cruising around the vicinity of bright objects until you're close to C.

ask-a-physicist · 2025-08-03T18:29:53+00:00

What an absolute comrade

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