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-   -   The Big Bang & String Theory (http://hintsforums.macworld.com/showthread.php?t=113930)

Hal Itosis 09-11-2010 02:18 AM

“The universe is expanding.
That should ease the traffic.”

—Stephen Wright

renaultssoftware 09-11-2010 08:02 AM

Yep, all the old Ford Meteors, Plymouth Satellites, et al. will have somewhere to go. :)

roncross@cox.net 09-11-2010 10:25 AM

Quote:

Originally Posted by Red_Menace (Post 595966)
I still don't quite get the continually expanding universe. It makes sense that the universe was expanding early in its life, but what is it doing now? If all that we can see is what was in the past (and the further out we see, the further in the past it gets), how would we even be able to determine what it is doing now? Sure we can see what the universe was doing 10 billion years ago, but for all we know it could be crashing in right now.

Good point, we are saying that the universe is expanding as we view it from the past because of course as you have mentioned, we don't know the exact state of the universe as it is right now. This is what I mean when I say we are limited by 3D space and light. Outer space is definitely beyond 3D because they say that if you were on another galaxy at the edge of the universe, then the milky way would be on the edge of the universe and you would appear to be at the center of the universe and the milky way would be expanding away from you at a very high rate of speed.

I suppose that if you could travel forward in time, then you would be able to take these measurements at various points in the future and know what the exact nature of space is today but I haven't figured out that one yet. Maybe instead of traveling in worm holes at the moment, I would suggest that we create worm holes to look at and gauge various parts of the universe as it may be today. Wouldn't this be a really cool way of seeing the universe?

In addition, the fact that some of these galaxies are traveling so fast means we quite possibly may never be able to catch up to them in the conventional sense since the most distance ones are traveling at a very high rate of speed close to the speed of light. So a worm hole is practical in this case.

renaultssoftware 09-11-2010 10:30 AM

This stuff is crazy! :) My head spins just thinking of it all.

roncross@cox.net 09-11-2010 11:00 AM

To get a little crazier renaultssoftware, if we were on the edge of the universe in another galaxy looking back at the milky way, then of course you would be looking back in time 13 billions years ago and of course you would not observe the Sun, Earth and the entire solar system because it wouldn't exist from that perspective -light hasn't travel that distance from the sun yet. In order to observe our solar system you would have to be within 4.6 billion light years from it. This means that it's quite likely that other galaxies and Solar systems have been created which we can not observe simply because they are too young for their light to have reached us. Maybe this is part of the dark matter that is unaccounted for but I don't know. But I do know that we are not capable of observing everything at once because of this limitation of light.

renaultssoftware 09-11-2010 12:54 PM

*drops on floor dead*

Red_Menace 09-11-2010 03:31 PM

Well, I just hope that whoever is blowing up this cosmic space-time ballon doesn't decide to make funny animals out of it.

renaultssoftware 09-11-2010 06:11 PM

That would be a good Star Trek show. "We have explored the universe's bounds, and we must report they are in the shape of an elephant."

Red_Menace 09-11-2010 07:26 PM

...or better yet, "the universe is in the shape of the number 42".

renaultssoftware 09-12-2010 07:17 AM

"Whoops, we've ripped the fabric." "Hey wait, my wife can sew." "No, Scotty."

Either way, I'd like to know something about the Big Bang: how does something explode from nothing?

fazstp 09-22-2010 09:14 PM

Just curious does creationism have an explanation for the visibility of stars more than 6000 light years away?

How about 10,000 year old trees?

Hal Itosis 09-23-2010 12:18 AM

Quote:

Originally Posted by fazstp (Post 596917)
Just curious does creationism have an explanation for the visibility of stars more than 6000 light years away?

The same way that earthlings could stare up at the (spherical) sun & moon for centuries, and yet imagine believe that the Earth was flat.

benwiggy 09-23-2010 03:48 AM

On a related point, there was a documentary on the BBC about life in the Vatican recently.
It had an interview with the Papal Astronomer, who is a Jesuit priest and a graduate of MIT.

"Religion teaches me that God created the universe; Science teaches me how he did it."

renaultssoftware 09-23-2010 08:03 AM

This here book (https://store.creation.com/ca/produc...p?sku=10-2-164) refutes people with his view. That includes Hugh Ross.

fat elvis 09-23-2010 04:05 PM

A few good books to read: Alice in Quantum Land, Wizard of Quarks. They are both written by the same author, Robert Gilmore. They were the first books I read about Quantum Mechanics. Very approachable books to give you a good overview of the theories without the crazy difficult calculations.

I think the experiment which sparked my interest is the double-slit experiment. It is one of those wikis that I had to read...then re-read many times until I could even attempt at wrapping my head around the experiment. Basically it "proves" that light is both a particle and a wave. I think this experiment actually produced more questions than answers...but it's a very interesting read.

Personally I don't think light is that special. IMO since it defines our existence we simply cannot comprehend beyond light.

renaultssoftware 09-23-2010 05:39 PM

What about fire? Where's that from? :confused:

fazstp 09-23-2010 10:28 PM

Quote:

Originally Posted by fat elvis (Post 596972)
Personally I don't think light is that special. IMO since it defines our existence we simply cannot comprehend beyond light.

Yeah I think the key here is comprehension. My gut feeling about string theory and quantum phenomena is that it is a convenient theory to work by until we understand what is really going on. While it works mathematically to help us work beyond our current level of comprehension the underlying theories seem a bit fruit-loopy.

fracai 09-23-2010 11:09 PM

Quote:

Originally Posted by renaultssoftware (Post 596974)
What about fire? Where's that from? :confused:

Magnets! How do they work? :mad:

Jay Carr 09-24-2010 01:55 AM

Quote:

Originally Posted by fracai (Post 596987)
Magnets! How do they work? :mad:

Gravity, how does that work! :eek: I'm told the two are closely related.

@renaultSoftware -- Fire is pretty simple, it has to do with chemical reactions. To put it simply (because I only know how to put it simply): Two atoms fuse together and the process lets off a large amount of energy. The first result of this energy is heat (like from a camp fire.) The second result of the fusing is that all of the electrons involved in the bonding process jump up a level in their respective orbits, and then suddenly jump back down. This process releases photons, which are the wave/particles that make up light. Thus, we get heat and light from some chemical reactions (like wood burning) which makes what we commonly refer to as "fire".

As I'm disconvering while reading "Alice in Quantum Land" (thanks fat elvis), photons and quantum's are apparently the same thing. That's a bit mind blowing, isn't it? They have a short summary of the story here.

fat elvis 09-24-2010 10:28 AM

Gravity? Magnets? Simple...they use THE FORCE

:D

and back to light...WTF is up with the constancy of it's speed?

e.g. you're in a car traveling 5,000 mph AWAY from a flashlight. If you measure the speed of the light from the flashlight it will measure the same as if you're traveling TOWARDS the source!!!

Conventional thinking would be that if you're moving towards the source of light at 5,000 MPH...the speed of the light particles would be the speed of light PLUS to the speed you're traveling (c + 5000).

So, our current scientific views of light are that it's both a particle and a wave...always travels at the same speed...obeys some "ether" in the universe that we cannot detect/measure/comprehend...and it has an "infinite mass" :rolleyes: This is why I think light is only special to us, and these oddities are simply a byproduct of our limited knowledge.


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