Author Topic: A Fun Thought?  (Read 6979 times)

FORTRANS

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dedndave

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Re: A Fun Thought?
« Reply #1 on: February 21, 2013, 09:35:42 AM »
that doesn't sound too bad
we wouldn't know what hit us, so minimal suffering - lol

KeepingRealBusy

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Re: A Fun Thought?
« Reply #2 on: February 21, 2013, 10:37:12 AM »
In a hundred billion years!

Dave.

MichaelW

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Re: A Fun Thought?
« Reply #3 on: February 21, 2013, 11:02:28 AM »
If our universe were “inherently unstable”, how could it survive for as long as it has?
Well Microsoft, here’s another nice mess you’ve gotten us into.

mywan

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Re: A Fun Thought?
« Reply #4 on: February 21, 2013, 11:24:50 AM »
An car is inherently unstable to, but you can still usually drive it quiet a few miles before it breaks.

Honestly though, I don't given much weight to these kinds of predictions. That's not to say our days aren't numbered by some mechanism or another, perhaps not unlike this one.

FORTRANS

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Re: A Fun Thought?
« Reply #5 on: February 22, 2013, 12:23:07 AM »
If our universe were “inherently unstable”, how could it survive for as long as it has?

Hi,

   Yeah, that was one thing.  Another is you can never test
the idea for correctness.  Or at least, one hopes not.  And
yet another is if they are right, you/they will never Know it.

   As to the inherently unstable part, the size of the universe
is probably a work around.  Our part is still okay even if the
majority of the rest has gone away.  Is the "universe" finite?

   Unless you like to really worry about such things, it was
silly enough to me, on top of being serious, to be a fun
excursion.

Cheers,

Steve N.

dedndave

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Re: A Fun Thought?
« Reply #6 on: February 22, 2013, 02:40:02 AM »
there are varying degrees of stability   :P

because the lifespan of a human is relatively short, we perceive "anything that doesn't go boom"
over several billion years to be quite stable

Vortex

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Re: A Fun Thought?
« Reply #7 on: February 22, 2013, 05:51:07 AM »
How they explain the unstableness with classical thermodynamics? Entropy, the quantitiy of randomness doesn't it lead to a non-stable system?

FORTRANS

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Re: A Fun Thought?
« Reply #8 on: March 01, 2013, 01:07:48 AM »
Hi,

   Someone else's take on it.  A clarification.

http://www.npr.org/blogs/13.7/2013/02/27/172766407/the-end-of-the-universe-the-higgs-and-all-the-ifs

Cheers,

Steve N.


drifter

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Re: A Fun Thought?
« Reply #9 on: March 01, 2013, 02:52:27 PM »
I like Rodger Penrose's take on the fate of the Universe:

The Universe expands at an exponentially increasing rate into the future.
Matter decays into photons with no mass.
With no mass, there is no gravity.
With no gravity there is no time.
With no time - distance and size becomes meaningless.
The infinitly large Universe is indistiguishable from the infinityly small Universe of the Big Bang.
Repeat.

FORTRANS

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Re: A Fun Thought?
« Reply #10 on: March 02, 2013, 01:04:40 AM »
Hi,

   Actually, while photons have no rest mass, they do travel
at the speed of light.  And with Einstein's equation, mass and
energy are interchangable.  So if you get enough energy, you
will get some gravity.  However, getting enough energy to
matter will be a bit of a problem.  You will end up creating
matter and antimatter long before you will notice any gravity
from a clump of energy.

Cheers,

Steve N.

drifter

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Re: A Fun Thought?
« Reply #11 on: March 02, 2013, 04:47:55 AM »
on: Feburary 1, 2013 at 01:04:40 AM FORTRANS wrote:
Quote
Actually, while photons have no rest mass, they do travel
at the speed of light.

He might have been refferring to some other massless particle (or wave) - at my age memory is meaningless  :redface:

FORTRANS

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Re: A Fun Thought?
« Reply #12 on: March 02, 2013, 09:06:13 AM »
Hi,

   I should have put a smiley in there somewhere.  While
photons have to have mass, it is as close to nil as needed.
On any sloppy day you can claim that they are massless,
and no one is going to call you on it.  Unless they are solar
sail spaceship fans or somesuch.

Regards,

Steve N.