251–260 of 547 posts
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There's always a relevant xkcd for every science question, and in this case it's one of the first ones: https://xkcd.com/54/
But oddly the most recent one as well https://xkcd.com/2723
I don't know if this instance qualifies as one, but I think its fair to say that cosmology is the one domain of "fundamental" physics where "discrepancies" or question marks keep piling up and not really resolving. It the pattern of previous science revolutions repeats, there could come a point where reinterpreting the large existing body of knowledge using a different paradigm would explain an number of "oddities" i…
Would you bet that we'll see a paradigm shift of a similar nature to the classical physics -> quantum mechanics / relativity paradigm change, but for Cosmology in our lifetimes?
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>Certainly there are many unexplained effects in solid state physics Wait for it… Why ice is slippery? Usual explanation is completely incorrect. Actual semi-conclusive research just recently happened.
It is not, because ice has a smooth surface and that probably the surface layer melts a bit because your shoes are warm? That would be my reasoning, but it likely seems to be wrong, well why?
That said, as anyone who has been in icy conditions can attest, it is clear that ice at ~0° C is vastly more slippery than at, say, -20°C.
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What do I have to study to understand all this in mathematical terms? Is an undergrad text good enough?
The universe is 13.7b yo, but due to acceleration of expansion, if you could "teleport", it's actually currently 93b ly across. So we're already in a bubble within a greater universe that we'll never be able to escape even if you could instantly reach lightspeed right now, and due to the expansion continuing to increase, the fractional size of this bubble relative to the rest is shrinking. Faraway galaxies that are "…
Great news. Finding stuff that doesn't fit into the current model and we need smart people to get to work understanding may be the surest sign that the JWST is invaluable.
This reminds me of how when you’re right, you don’t learn much. When you get it wrong, you learn a ton.
It seems much more likely that we are not missing a formula but a basic understanding of reality. Much like the early astronomers trying to find a formula for the movement of the sun and planets that put Earth at the center of the universe
Worth noting: For a very long time MOND has been predicting earlier galaxies than LCDM.
As far as I know , MOND is not compatible with some observations. So dark matter and MOND have to be tweaked to agree with what we see.
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>Certainly there are many unexplained effects in solid state physics Wait for it… Why ice is slippery? Usual explanation is completely incorrect. Actual semi-conclusive research just recently happened.
It is not, because ice has a smooth surface and that probably the surface layer melts a bit because your shoes are warm? That would be my reasoning, but it likely seems to be wrong, well why?
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So such an expansion phenomenon should affect everything uniformly right? Are we (people /animals) then getting "bigger"? Over time innthe extreme will it cause problems in signal transmission in our own nervous systems (since apparently we have a problem seeing light beyond the observable limit)
The strong nuclear force, electromagnetic force, and even gravity are strong enough to overwhelm the expansion within individual galaxies and even local groups of galaxies. In other words the expansion of spacetime very very very slightly tries to shift the atoms of your body apart but we can't even detect it because ordinary forces like chemical (electromagnetic) bonds are exponentially stronger - enough to pull thi…
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I think this says less about cosmology and more about the incredibly effectiveness of the standard model in the regime we can test directly on earth. If we compare ΛCDM to most other scientific theories it doesn't look so bad in terms of discrepancies. Certainly there are many unexplained effects in solid state physics, there isn't even an accepted explanation for why rubbing a balloon on your head makes it stick to…
> there isn't even an accepted explanation for why rubbing a balloon on your head makes it stick to a wall But the accepted explanation is "static electricity", no? Or do you mean we don't "really" know when asking a couple of follow-up "why?" questions further?
[1] https://www.lesswrong.com/posts/L22jhyY9ocXQNLqyE/science-as...
[2] https://www.lesswrong.com/posts/NMoLJuDJEms7Ku9XS/guessing-t...