again i have another question for some physicist's

[launchpadmcqwak]

sorry if i am in the wrong topic area or something but i have one more question:

in the heat death scenario what happens to gravity? any reply will be helpfull

 

[isometry]

In the heat death scenario the total amount of gravity from all the energy + mass (+ dark energy) is not enough to stop the universe from expanding forever. Gravity is still there, but it loses out to the expansion so the particles keep getting more and more spread out (which makes them colder and colder).

 

[launchpadmcqwak]

In the heat death scenario the total amount of gravity from all the energy + mass (+ dark energy) is not enough to stop the universe from expanding forever. Gravity is still there, but it loses out to the expansion so the particles keep getting more and more spread out (which makes them colder and colder).

but correct me if I'm wrong but in heat death isn't all the energy gone so nothing will be moving at all, so wont the whole universe be still and not expanding?...i am no scientist i just cant wrap my head around the whole thing

 

[Batou667]

all the energy gone so nothing will be moving at all, so wont the whole universe be still

Atoms/particles don't need energy to move, they need energy to accelerate.

Pretty sure that in a "heat death" scenario the force of gravity still exists, it's just that all objects are so far apart as to make it negligible.

 

[Oirish_Martin]

Heat death isn't that energy is gone (conservation of energy and all that), it's that the entropy is so high that no work can be done anywhere (i.e no energy can be fed into a system). There's still energy there, it's just...er..."spread out" too thinly, for want of a better description of entropy. The lower the entropy of a system, the more energy can be extracted from it.

What this means for gravity specfically, I'm not sure.

 

[DasDestroyer]

Perhaps you could do your homework elsewhere next time?

In any case, from what I remember, heat death is when, because loss of energy to small amounts of heat via friction and whatnot, all the energy in the universe becomes spread out heat energy, which is impossible to turn back into "usable" energy, and as such there will be no more energy for anything to move.