Deep freeze

azizlwl

Today i watched Discovery about the fate of the universe.
One of the presenters said that finally all the energies used up and the universe will be in deep freeze.

My question is where all the energies go?
What about conservation of energies?


Thank you.

tiny-tim

hi azizlwl!
i think the energy stays the same, but the energy density tends to zero

Drakkith

Over time the stars will run out of fuel and cease to shine and all thermal energy will be radiated away from all objects. Without a source of energy the entire universe will gradually approach absolute zero. The expansion of the universe ensures that any energy radiated away will be redshifted into longer wavelength light, lowering it's energy. Energy conservation does not apply in it's normal form when dealing with the expansion of the universe. The subject is actually kind of complicated and I have no chance of trying to explain the details.

Radrook

Here are two relevant articles you might want to read.


Future of an expanding universe
http://en.wikipedia.org/wiki/Future_...nding_universe




Second law of thermodynamics "broken"
http://www.newscientist.com/article/...cs-broken.html

DhruvKumar

It doesn't mean that universe will freeze , universe will have less energy.Universe will not freeze at once it will start from the end where there is less supply of energy.

FOIWATER

http://en.wikipedia.org/wiki/Heat_death_of_the_universe

Drakkith

The cooling process will occur equally everywhere in the universe when you look at the largest scales. At the smaller scales individual sections and objects will vary, but over time these variations will die off as the final stars begin to run out of fuel, white dwarfs cool off, etc.

DhruvKumar

All stars will not runoff fuel at once. will it?

Drakkith

Nope. Stars are being created and die off all the time, with the exact lifetime of each star depending mostly on it's initial mass. High mass stars will live for a much shorter time than low mass stars. Low mass red dwarfs will still be hot and shining for many many billions of years.

qraal

Energy remains the same. What declines are the temperature differences. Eventually a bland equilibrium will be reached, meaning the end of all change.

DhruvKumar

ya thatz what i was thinking of.

DhruvKumar

ya thatz what i was thinking of.
Today I am very happy because i have created my own telescope from 100 cm focal length convex lense.

DhruvKumar

ya thatz what i was thinking of.

Today I am very happy because i have created my own telescope from 100 cm focal length convex lense.