Indeed. I was about to say that I doubt that many (any?) of the faculty who were there when I studied there would still be around, or alive, but I checked and can see some familiar names in the Emeritus Faculty list: Hans Herzberger, Alasdair Urquhart, and even John Slater. I don't see Bas van Frassen there any more, but he was splitting his time with Princeton when I studied with him.
I'm not going repeat everything I've already said. Issues relating to the translation of theoretically complex and difficult notions arises is many subject areas besides physics, including philosophy.
Let me just say that there are plenty of very smart people who at least try to make sense of difficult theories in everyday terms using analogies of various sorts, and who succeed to varying degrees. Since there seem to be some very smart people here on this forum, I was simply trying to encourage the effort. If you or the other people here can't (or won't) do it then that's fine, but that doesn't mean it can't be done.
Let me just say that there are plenty of very smart people who at least try to make sense of difficult theories in everyday terms using analogies of various sorts, and who succeed to varying degrees. Since there seem to be some very smart people here on this forum, I was simply trying to encourage the effort. If you or the other people here can't (or won't) do it then that's fine, but that doesn't mean it can't be done.
There is a distinct difference between dip and snus. Snus is steam pasteurized whereas dip is fermented. The result is that snus does not end up containing the main carcinogenic ingredients of dip; nitrosamines.
This is not to say that snus is 100% safe. I am sure it is still better not to have it at all. However it is unfair to lump it together with dip.
Think of the surface of a balloon. Just the surface. Nothing else. Blow it up so it is bigger. Still think just of the surface. The surface expanded - things on the surface got farther apart.
We know that the balloon expanded because some air outside the balloon got moved inside the balloon. That is because the surface of a balloon is a (curved) 2-D surface embedded in a (flat) 3-D space.
The universe is not like that. It is a curved 4-D surface which as far as we know is not embedded in anything else. As I am not a cosmologist that is about as far as I can go in giving an everyday analogy. It is almost certainly seriously misleading. The big snag with these analogies is that people forget my previous sentence and start trying to 'do science' based on everyday analogies. The 'water flow' analogy for electric current is one which leads lots of newbies astray.
We know that the balloon expanded because some air outside the balloon got moved inside the balloon. That is because the surface of a balloon is a (curved) 2-D surface embedded in a (flat) 3-D space.
The universe is not like that. It is a curved 4-D surface which as far as we know is not embedded in anything else. As I am not a cosmologist that is about as far as I can go in giving an everyday analogy. It is almost certainly seriously misleading. The big snag with these analogies is that people forget my previous sentence and start trying to 'do science' based on everyday analogies. The 'water flow' analogy for electric current is one which leads lots of newbies astray.
However, is space really a curved 4-D structure or is it just that our perception of it distorted gravity makes it appear as such. to us ?
Again, let's not confuse the universe with space which is what the universe is contained in.
Think of it this way.... ..
You can have completely empty space , void of any matter or energy but still have .....empty space which in reality does not exist .
What did we have before the 'big bang"?
That is debatable of course but, the best guess is just empty space that continued on to infinity as nothing existed before that.
Now, we still have a non existing infinite void that is what we call space but, a universe is now contained in it .
W e call it "space to reflect this and for lack of a better name.
BTW, the more scientists learn about our bizarre universe, the more it appears that you can indeed get matter and energy out of nothing .🙂
Again, let's not confuse the universe with space which is what the universe is contained in.
Think of it this way.... ..
You can have completely empty space , void of any matter or energy but still have .....empty space which in reality does not exist .
What did we have before the 'big bang"?
That is debatable of course but, the best guess is just empty space that continued on to infinity as nothing existed before that.
Now, we still have a non existing infinite void that is what we call space but, a universe is now contained in it .
W e call it "space to reflect this and for lack of a better name.
BTW, the more scientists learn about our bizarre universe, the more it appears that you can indeed get matter and energy out of nothing .🙂
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Agree with that . And also Plato and shadows on the cave wall...
(isn't the whole point of the balloon analogy is to consider only the balloon's membrane, ignore the air outside and inside it. )
Well, the membrane is 3 dimensional (no matter how thin). I think that is why he said "surface" which is 2D.
I like that analogy. One book I've read (can't remember which; I've read more than one) suggested we (planets, stars, galaxies, whatever) are like ants on that balloon. Just as with the universe, with the balloon expanding, all ants move away from any other ants, yet the surface is bounded. Also, when you start walking across the balloon, eventually you find yourself back where you started which apparently (in the limiting case) is also a property of the universe.
Somehow this appeals to my simple mind 😉
jan
But is the expansion limited to the "space" between everything, or does it also include everything "in" the Universe?
I like the idea that the Universe, when reduced to a single "substance" (sorry to use Spinoza's term, which can be easily misunderstood) is exanding all at once. This expansion necessarily includes not just the "space", but Everything.
So, the ants are getting "bigger", too. 🙂
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If everything is expanding at the same rate in the same directions then how would you even know it was expanding ? - isn't the idea is that space expands but the objects in space do not ?
Perhaps everything is expanding, and due to relativity we cannot tell that it is expanding, but what we are perceiving is the expansion of our own minds, which we conclude is the expansion of the Universe (since we reject the notion that our minds are expanding).
😀
Not sure we know what the Universe is expanding into but I do know my belly is expanding into the Universe.
That's what I call Thread-evolution... (some Darwin too?)
...Highest rate of death on this planet.
Highest cause of death on this planet.
We simply cannot have a more expanded thread than this one about the Universe as known to man, and the Multiverse theory, the Big Bang, and what it is expanding into. ...Infinite chain reaction of all events in time and space and light, from the smallest to the largest. ...And including human's behavior over the course of his entire existence on planet Earth; the human race in its natural and prefabricated habitat with all the wild animals of the jungle and the civilized (domesticated) ones. ...Till this very present moment.
I think that we are nothing and everything at the same time; like an expansion of something so large that we'll never be able to comprehend except from our very limited knowledge on theories and all that jazz.
...From the coffins of Earth's central core to the snow melting from the mountain peaks, to the rivers cascading and icebergs slowly moving at the surface of our oceans, to the fires erupting with ashes from the volcanoes and lightnings crashing from the sky above our heads and the air alimenting their power in winds of fury, to the boulders breaking under pressure and falling and blocking our accesses to roads and villages, to the infinite space of our galaxy among a multitude of other galaxies of the vast dimensional universe from the holographic multiverse...and beyond.
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It would be like denying the search of scientific knowledge; won't happen for another 466 billion light years!
In audio, physics play an important and essential role. ...The space acoustical properties (at various altitudes too), and the drivers' sound propagation; in the frontal hemisphere.
...Plus much much more more ....
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For those who enjoy thinking about things like this, I recommend one of my
favorite books, The End of Science by John Horgan. It's not really
about the end of science.
😎
favorite books, The End of Science by John Horgan. It's not really
about the end of science.
😎
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