- If 0 is ‘no physics has been realised’, and 100 is ‘all possible physics theories have been proven’, where do you think humanity stands today?
I know this is logically impossible to know, and ‘completing physics’ does not make sense, I just want to hear some interesting perspectives on where we stand, so humour me.
506 points911 comments6 d ago
- Is it theoretically possible to sharpen a standard chef's knife so finely that gravity alone, working with the weight of the knife, would be enough force to slice a block of cheddar cheese?
213 points157 comments6 d ago
- If you had an antimatter Sun and launched it at the real Sun from outside the solar system, would it even reach the Sun or would it just annihilate off the solar wind, interplanetary medium and other particles before reaching it? And how would this impact the Solar System?
Assuming this anti-Sun has the same composition, mass, volume and density as the real Sun but made of antimatter
78 points90 comments3 d ago
- Theoretical upper bound on temperature?
I know that 0K, absolute zero, is the theoretical point where an atom is perfectly stationary and without vibration. Does this imply a theoretical maximum temperature ("absolute hot") where an...
57 points35 comments5 d ago
- If electrical energy travels through electromagnetic fields around the wires, what exactly do the wires do, and why are they needed to power a light bulb?
52 points88 comments2 d ago
- What if the universe has no objective "present"?
According to Einstein's theory of relativity, observers moving at different velocities can disagree about which distant events happen simultaneously. This raises a question that I can't quite get...
44 points119 comments4 d ago
- Is there any reason why gravity attracts object and not repel?
42 points87 comments2 d ago
- Is General Relativity a simplified model?
So I am nearing the end of my GR course and after months of rigorous Differential Geometry, logically proven concepts and theorems and precisely defined objects like Riemann tensor, maifolds,...
41 points50 comments5 d ago
- Newtons 3rd law confuses me
Anyone else confused about this law? I mean if i have a pen and I poke it through paper, shouldnt the paper have fought back in this instance of the law? Or like i have a hammer and nail....
39 points31 comments3 d ago
- Why can't you accelerate out of a Black Hole?
I recently learned that event horizons don't form directly due to high gravity but due to the escape velocity caused by it, and that gravity near the event horizons of supermassive black holes is...
39 points153 comments3 d ago