Technically speaking, a neutron star is one big atomic nucleus. But in that case it's gravity binding everything together instead of the strong force.
Though nuclear physics isn't my area of expertise, finding stable nuclei in the very high nucleon numbers is kind of the holy grail in that...
I don't think measuring the freefall time is the best way to measure local gravity. Mostly due to DrPizza's objections, but this was figured out centuries ago.
A much more precise and repeatable way of measuring gravity is to use a pendulum, again figured out centuries ago. Incidentally, since...
That's the thing, gravity *is* curved spacetime, and an energy density curves spacetime. Therefore, energy density = curved spacetime = gravity.
Next point, electromagnetic fields have an energy density associated with them, you just square the fields (E and B) with the appropriate constants...
We don't really expect large electric fields to exist except perhaps locally since a charged body will quickly find it's opposite and neutralize. We do see some pretty big magnetic fields. Basically, the energy associated with either field goes into the stress-energy tensor from GR and does all...
To really answer this, we would need to know what the temperature of the air was outside *and* the temperature in the trunk.
Given that you said the car was outside for a long time in the cold, it's probably a safe assumption to say that the air temperature was the same outside as it was for...
I think even in the worst case scenario with the magnetron sitting naked on the counter next to the fridge, you would have a tough time affecting anything in the fridge, including the electronics.
I mean, a fridge is a pretty good faraday cage itself with it being encased in sheet metal and...
Hubble's expanding universe *was* the main evidence for the Big Bang. Until the CMB and its associated power spectrum were discovered. Now that is our smoking gun for Big Bang plus standard inflation.
This isn't to say that this is definitely correct, but it is certainly our leading theory by...
First, though I am an astrophysicist, I don't profess to be an expert on GR, especially the Kerr metric.
That said, as to the reason why the high gravitational force doesn't crush you, I think you are on the right track with your guess.
As for his hand waving about the tidal forces, I...
Thinking about the uncertainty principle like the Fourier Transform is no mere analogy either. The uncertainty principle is a direct result of position and momentum being Fourier Transform pairs within a factor of h (you can arrive there using Plancherel's theorem).
I can't help but think...
Neutron stars and black hole mergers are simulated quite often. The physics is very demanding as it requires solving some very tough GR and in the case of neutron stars, nuclear physics. In addition, accretion disks and magnetic fields tend to confuse a lot of things.
That said, there are...
I'm not entirely sure how to answer that.
The virtual particles being created near the event horizon is effectively Hawking Radiation.
As far as the compression and expansion of space due to a moving black hole...changes to the metric propagate at the speed of light and so all GR effects...
I quickly perused the article, it looks like this is the distortion of starlight around a spinning black hole + accretion disk. The coordinates are strange and they didn't provide any caption or anything.
It does appear that any similarities you are seeing between the dipole field of the...
It's not entirely coincidence, GR and EM theory can be unified at a certain energy scale. You can even see the similarities in the simplified force equations (Newton vs Coulomb law):
F_coulomb = k q1 q2 / r^2
F_gravity = -G m M / r^2
But there are some very important differences, the...
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