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Old 08-08-2009, 03:02 AM #22
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you will have to take many a science class to understand this exactly.

for the short answer

it turns into heat
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Old 08-08-2009, 08:03 AM #23
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So have a rather strange question.

If the universe is expanding constantly, and the space between matter increases, and there are spots of high gravity that form stars or whatever, and these stars will all eventually die out in a few different ways with most becoming dead mass, will there be a time of complete death of the energy or heat of our universe?

Constant states of entropy give to enthalpy, that means eventually, all energy will be settled. Eventually.

Meaning when our star dies out, it will eventually go thuogh stages to become a brown dwarf. Meaning little to no heat go out into our solar system. All stars will die right?

Even big ones turn out to explode, and if their big enough, just creat more stars. Or gravity wells.

So TL;DR, All energy dies out eventually right? Either it turns into mass or settles?
Yes, all energy will eventually become completely unusable. Atoms will cease to vibrate and the temperature in the universe will drop to absolute zero.

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you will have to take many a science class to understand this exactly.

for the short answer

it turns into heat
Not completely.
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Old 08-08-2009, 09:56 AM #24
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Yes, all energy will eventually become completely unusable. Atoms will cease to vibrate and the temperature in the universe will drop to absolute zero.
Ayee...Wait, wouldn't the universe have to expand an infinite amount
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Old 08-08-2009, 11:24 AM #25
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the way i look at it is that the universe is just in a constant cycle.
as it expands father and farther away less grvity is making it stable.
then when it expands to much it will fall in on its self into a single atom of exstremly dense mass.
next step: big band and it all starts over again.

thats just what i think. if u think about it it acually make sense.
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Old 08-08-2009, 11:38 AM #26
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Ayee...Wait, wouldn't the universe have to expand an infinite amount
No, as the energy keeps getting used, some of it is made unusable. As time increases, so does this amount of unusable energy. Eventually all energy will be unusable.
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Old 08-08-2009, 11:42 AM #27
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No, as the energy keeps getting used, some of it is made unusable. As time increases, so does this amount of unusable energy. Eventually all energy will be unusable.
But isn't the universe a closed system/
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Old 08-08-2009, 11:49 AM #28
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thats just the thing. we dont know.
some theorys say that the universe is a closed system.
well others do not.
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Old 08-08-2009, 11:52 AM #29
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But isn't the universe a closed system/
Yes, the fact that it's closed means new energy can't come in to replace the unusable energy.
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Old 08-08-2009, 11:53 AM #30
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Yes.
Ooookay. Wait a second, I thought if the universe was a closed system, energy doesn't go anywhere, it just takes on many different forms. Therefore, if the universe is a closed system, it could be around for an infinite amount of time because it would never lose energy. Where if it is an open system, it had to have a set starting date, or it couldn't been around for an infinite amount of time because all energy would be gone.
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Old 08-08-2009, 11:58 AM #31
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Ooookay. Wait a second, I thought if the universe was a closed system, energy doesn't go anywhere, it just takes on many different forms. Therefore, if the universe is a closed system, it could be around for an infinite amount of time because it would never lose energy. Where if it is an open system, it had to have a set starting date, or it couldn't been around for an infinite amount of time because all energy would be gone.
The energy remains, but it becomes an unusable form.
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Old 08-08-2009, 01:42 PM #32
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Not completely.
*very short answer?

happy with that?
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Old 08-08-2009, 02:30 PM #33
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The energy remains, but it becomes an unusable form.
So you are saying that it is impossible for the universe to have ALWAYS existed

Edit: or maybe that when it runs out of energy, it collapses on itself making all energy usable again and then big bang?
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Old 08-08-2009, 02:45 PM #34
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So you are saying that it is impossible for the universe to have ALWAYS existed

Edit: or maybe that when it runs out of energy, it collapses on itself making all energy usable again and then big bang?
Now that would be trippy. If this was true for all we know we are living in like the 1000000000000000000000000th rendition of the universe.
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Old 08-08-2009, 03:07 PM #35
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Since the topic of where energy goes has been brought up, I'll ask some questions that have been on my mind for some time now. When a human dies, where does his life force(the energy that makes us sentient life forms) go? After death, our bodies lose 27 grams of weight. What is it that we lose? I for one have no idea.
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Old 08-08-2009, 03:23 PM #36
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Energy will never cease to exist, as long as their is mass. Which there always will be. (At least if the system is closed, but even then, it'd just escape into something else...it shouldn't ever disappear.)

E=MC^2

Energy equals mass times the speed of light squared. Just as a side note - the speed of light moving is so high that this formula implies that any small amount of matter has a hell of a lot of energy. This energy can be released in numerous ways...light, nuclear, heat, etc.

So, even in the sense of "unusable" energy...that'd simply be incorrect...gravity is still there no matter how insignificant.
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Old 08-08-2009, 03:31 PM #37
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Originally Posted by Cpt.Obvious View Post
Since the topic of where energy goes has been brought up, I'll ask some questions that have been on my mind for some time now. When a human dies, where does his life force(the energy that makes us sentient life forms) go? After death, our bodies lose 27 grams of weight. What is it that we lose? I for one have no idea.
This is basically a question of faith, and an indication that you watch too many movies. BTW it is allegedly 21 grams, not 27.
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Old 08-08-2009, 03:45 PM #38
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Quote:
Originally Posted by Cpt.Obvious View Post
Since the topic of where energy goes has been brought up, I'll ask some questions that have been on my mind for some time now. When a human dies, where does his life force(the energy that makes us sentient life forms) go? After death, our bodies lose 27 grams of weight. What is it that we lose? I for one have no idea.
The soul experiment was very very poor. When you die, various gases and fluids escape, that's what the 21 grams would have likely been. When you die, the brain ceases to have electrical function thus you cease to exist. There is no "life force" outside of that.

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So you are saying that it is impossible for the universe to have ALWAYS existed

Edit: or maybe that when it runs out of energy, it collapses on itself making all energy usable again and then big bang?
If the universe always existed, then our laws of thermodynamics are wrong. For the universe to collapse back on itself, gravity has to counteract the momentum of expansion. Gravity is too weak to do this in our universe.
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Old 08-08-2009, 03:50 PM #39
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The soul experiment was very very poor. When you die, various gases and fluids escape, that's what the 21 grams would have likely been. When you die, the brain ceases to have electrical function thus you cease to exist. There is no "life force" outside of that.



If the universe always existed, then our laws of thermodynamics are wrong. For the universe to collapse back on itself, gravity has to counteract the momentum of expansion. Gravity is too weak to do this in our universe.
Apparently the experiment has never been successfully replicated...



Also, isn't the expansion of the universe slowing?
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Old 08-08-2009, 04:00 PM #40
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Apparently the experiment has never been successfully replicated...



Also, isn't the expansion of the universe slowing?
...Uhm - you guys are going to get into a mess of really debatable physics...

http://www.astro.ucla.edu/~wright/cosmo_constant.html

Here's a decent link explaining several different theories and thoughts of expanding/collapsing of the universe...
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Old 08-08-2009, 04:02 PM #41
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...Uhm - you guys are going to get into a mess of really debatable physics...

http://www.astro.ucla.edu/~wright/cosmo_constant.html

Here's a decent link explaining several different theories and thoughts of expanding/collapsing of the universe...
****, its my least favorite kind of debate.
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Old 08-08-2009, 04:15 PM #42
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The soul experiment was very very poor. When you die, various gases and fluids escape, that's what the 21 grams would have likely been. When you die, the brain ceases to have electrical function thus you cease to exist. There is no "life force" outside of that.



If the universe always existed, then our laws of thermodynamics are wrong. For the universe to collapse back on itself, gravity has to counteract the momentum of expansion. Gravity is too weak to do this in our universe.
these are some big words...nice to have a physicist around here
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