Recent content by PeroK

There was a joke in the Big Bang Theory, where Sheldon would claim that, as an expert in fundamental physics, he understood everything. And, he would say this while being driven to the University as he didn't know how to drive a car!

:welcome: If you want to learn science properly, you probably have to specialise somewhat. Evolutionary biology and Quantum Mechanics are poles apart. There is no Theory of Everything!

Two obvious questions are: 1) Our universe contains billions of galaxies. That must have been some monster black hole in the parent universe. Is a star of that physical size possible? The universes in the black holes within our universe would only have the total matter of a large star...

I'm not an expert, but that sounds more like science fiction to me. A better understanding of what happens inside the event horizon of a black hole depends on a quantum theory of gravity. So, no one knows. Also, a singularity is not a physical thing. It is literally where a mathematical...

Are you planning to be around 100+ years from now?

In Helliwell's SR book, he says "every new theory swallows the previous one whole"! Newton is inside SR, which is inside GR, which will be inside a Quantum theory of gravity.

The idea that Richard Feynman didn't understand the basics of relativity as well as anyone else who ever lived is cretinous.

There's no single, correct way to explain the twin paradox. People on YouTube who prefer a certain explanation like to say that everyone else is wrong. It's ultimately about click bait.

What does conservation of (horizontal) momentum give you?

What quantity is conserved in this scenario?

A book that lies unopened conceals its wisdom.

If you find yourself alone on a Saturday night, you cannot blame the laws of physics.

Mr3000 asks the same question ad infinitum. When infinite time has passed, he shall have our answer.

Moreover, this sort of idle speculation is probably just a waste of time. Anyone can throw words together. Learning real physics, on the other hand, is hard work!

That's not the point at all. The point at issue is that if we were visited by an alien intelligence from a star, say, 20 light years away. Then that is what they would say: "we've come from a star 20 light years away". It wouldn't make sense for us to say "No, you haven't ... in your...