Normally, I’m all for language changing over time. If some word is used a certain way, so beit. But not here. Not in a case where people can end up saying dumb shit like “Evolution is just a theory.” I will physically fight people on that, If need be.
A law describes what happens, a theory explains why. The law of gravity says that if you drop an item, it will fall to the ground. The theory of relativity explains that the “fall” occurs due to the curvature of space time.
Science can never answer “why.” In your example, the question why is just moved, from “why does it fall?” to “why does mass distort space-time?” In both cases physics just describes what happens.
Not every action needs a cause. Especially when entering the subatomic level, quantum effects appear to be fully probabilistic. Nothing causes the electron to emit a photon exactly then at exactly that energy, it’s just something that happens.
Even at the largest scales, quantum effects have shaped the structure of superclusters of galaxies and in many models underpin the beginning of the universe.
At these extreme ends, the concept of causality gets weaker, and asking “Why?” starts to lose meaning. You could say nothing caused many things, or equally say they happened because they could.
In all cases encountered so far however, learning more has enabled us to identify new limits on possibility, and usually to narrow down on the details. It’s a practically endless series of "why"s that grow ever more exact, until we find the limits of what can be known. Maybe this chain has an end, maybe not, but to claim that science cannot answer any “Why?” is just wrong.
Sorry for taking so long to write a response. I had to think a bit about this.
So, I don’t think it feels very satisfying to the average physicist to just say “well, atoms sometimes just spontaneously emit photons”. It’s a model that correlates well with our measurements, but there’s no proof that it is true.
In some sense, the purpose of science is to make sense of the world, and it surely isn’t the most satisfying thing to be left without an ulterior explanation. That is why I think it is important to repeatedly ask why, until one finds the primordial source of causality.
Oh, absolutely! There are lots of physicists working right now to figure out the ins and outs of advanced quantum mechanics. There’s been a century long fight between the ones who think our current rules must be incomplete and the ones who don’t care why the rules are what they are so long as they work. There’s a surprising amount of dogma here too, with schools of thought being supported by proponents instead of science. I think that’s changing now, but I feel like that’s partly why physics hasn’t really expanded quantim physics at all.
So perhaps we will find a solid causal link between everything. Perhaps we’ll nail down entropy as a real property instead of just a statistical observation. Maybe we’ll truly understand the origins of not just this part of the universe, but the wider multiverses through time, space, and fields.
But maybe we’ll find that causality isn’t so solid, with time-like paths everywhere, and determinism only at medium scales. Perhaps the nature of existence is beyond gleaming for those held within.
Right now, we have no idea one way or the other. I definitely agree with continuing to ask why, but even the existence of the answers is up for debate, let alone the nature of those answers. I’m especially cautious of putting convenient explanations in the place of those unkowns.
So maybe saying so authoritatively that some causes don’t exists was an error on my part. Sorry about that. It would be more accurate to say that some causes might not exist, especially in some models, and that we can’t tell the difference yet.
In a scientific context, a hypothesis is a guess, based on current knowledge, including existing laws and theories. It explicitly leaves room to be wrong, and is intended to be tested to determine correctness (to be a valid hypothesis, it must be testable). The results of testing the hypothesis (i.e. running an experiment) may support or disprove existing laws/theories.
A theorem is something that is/can be proven from axioms (accepted/known truths). These are pretty well relegated to math and similar disciplines (e.g. computer science), that aren’t dealing with “reality,” so much as “ideas.” In the real world, a perfect right triangle can’t exist, so there’s no way to look at the representation of a triangle and prove anything about the lengths of its sides and their relations to each other, and certainly no way to extract truth that applies to all other right triangles. But in the conceptual world of math, it’s trivial to describe a perfect right triangle, and prove from simple axioms that the length of the hypotenuse is equal to the square root of the sum of the squares of the remaining two sides (the Pythagorean Theorem).
Note that while theorems are generally accepted as truth, they are still sometimes disproved - errors in proofs are possible, and even axioms can be found to be false, shaking up any theorems that were built from them.
Normally, I’m all for language changing over time. If some word is used a certain way, so beit. But not here. Not in a case where people can end up saying dumb shit like “Evolution is just a theory.” I will physically fight people on that, If need be.
Could you explain the difference to me? 🙏
A law describes what happens, a theory explains why. The law of gravity says that if you drop an item, it will fall to the ground. The theory of relativity explains that the “fall” occurs due to the curvature of space time.
Science can never answer “why.” In your example, the question why is just moved, from “why does it fall?” to “why does mass distort space-time?” In both cases physics just describes what happens.
But that is why it happens. Causality in most certainly something that can be discerned scientifically.
But then, to follow up on your statement, what is the cause of all causes?
In other words, where does the chain of causes begin?
Not every action needs a cause. Especially when entering the subatomic level, quantum effects appear to be fully probabilistic. Nothing causes the electron to emit a photon exactly then at exactly that energy, it’s just something that happens.
Even at the largest scales, quantum effects have shaped the structure of superclusters of galaxies and in many models underpin the beginning of the universe.
At these extreme ends, the concept of causality gets weaker, and asking “Why?” starts to lose meaning. You could say nothing caused many things, or equally say they happened because they could.
In all cases encountered so far however, learning more has enabled us to identify new limits on possibility, and usually to narrow down on the details. It’s a practically endless series of "why"s that grow ever more exact, until we find the limits of what can be known. Maybe this chain has an end, maybe not, but to claim that science cannot answer any “Why?” is just wrong.
Sorry for taking so long to write a response. I had to think a bit about this.
So, I don’t think it feels very satisfying to the average physicist to just say “well, atoms sometimes just spontaneously emit photons”. It’s a model that correlates well with our measurements, but there’s no proof that it is true.
In some sense, the purpose of science is to make sense of the world, and it surely isn’t the most satisfying thing to be left without an ulterior explanation. That is why I think it is important to repeatedly ask why, until one finds the primordial source of causality.
Oh, absolutely! There are lots of physicists working right now to figure out the ins and outs of advanced quantum mechanics. There’s been a century long fight between the ones who think our current rules must be incomplete and the ones who don’t care why the rules are what they are so long as they work. There’s a surprising amount of dogma here too, with schools of thought being supported by proponents instead of science. I think that’s changing now, but I feel like that’s partly why physics hasn’t really expanded quantim physics at all.
So perhaps we will find a solid causal link between everything. Perhaps we’ll nail down entropy as a real property instead of just a statistical observation. Maybe we’ll truly understand the origins of not just this part of the universe, but the wider multiverses through time, space, and fields.
But maybe we’ll find that causality isn’t so solid, with time-like paths everywhere, and determinism only at medium scales. Perhaps the nature of existence is beyond gleaming for those held within.
Right now, we have no idea one way or the other. I definitely agree with continuing to ask why, but even the existence of the answers is up for debate, let alone the nature of those answers. I’m especially cautious of putting convenient explanations in the place of those unkowns.
So maybe saying so authoritatively that some causes don’t exists was an error on my part. Sorry about that. It would be more accurate to say that some causes might not exist, especially in some models, and that we can’t tell the difference yet.
I was referring to the difference between a theory and a hypothesis.
Theorem would also be interesting to add to the mix.
In a scientific context, a hypothesis is a guess, based on current knowledge, including existing laws and theories. It explicitly leaves room to be wrong, and is intended to be tested to determine correctness (to be a valid hypothesis, it must be testable). The results of testing the hypothesis (i.e. running an experiment) may support or disprove existing laws/theories.
A theorem is something that is/can be proven from axioms (accepted/known truths). These are pretty well relegated to math and similar disciplines (e.g. computer science), that aren’t dealing with “reality,” so much as “ideas.” In the real world, a perfect right triangle can’t exist, so there’s no way to look at the representation of a triangle and prove anything about the lengths of its sides and their relations to each other, and certainly no way to extract truth that applies to all other right triangles. But in the conceptual world of math, it’s trivial to describe a perfect right triangle, and prove from simple axioms that the length of the hypotenuse is equal to the square root of the sum of the squares of the remaining two sides (the Pythagorean Theorem).
Note that while theorems are generally accepted as truth, they are still sometimes disproved - errors in proofs are possible, and even axioms can be found to be false, shaking up any theorems that were built from them.
4 months later, sorry for the late reply. Thank you for this explanation! 😁🙏