- #1
akashpandey
- 90
- 4
If temperature of universe is cooling then why universe is expanding.
Last edited by a moderator:
akashpandey said:If tempreture of universe is cooling so
Why universe is expanding.
Which theory?akashpandey said:But according to the theory universe is expanding
I don't know what you're talking about!akashpandey said:Hey suraj are you from RJ colleg
See the total energy of the universe is a constant, but its expanding, using up internal energy(i presume).. The internal energy is a function of temperature(directly proprtional), so the temperature has to drop.akashpandey said:Plzzz explane my question in brifly
from the past 7.2 billion years the temperature has dropped by just about 3°C.akashpandey said:According to u suraj if internal energy of universe is end then expanding of universe will stop.
Please elaborateakashpandey said:But these is new theory .
There is a discution on that theory in present among scientist.
This is ridiculous since it is totally controverted by tons of solid evidence which shows that the observable universe is expanding at an amazing accelerated rate. Things at the edge of our observable universe are receding at about 3c which certainly is not even remotely possible inertially.slatts said:... So the continuing expansion of the bubble (or pocket, or island, or "local universe") that contains our observable region is purely inertial ...
Explain to me how any of that has anything to do with obtaining a recession velocity of 3c due to inertia.slatts said:It is an accelerated rate, but, in the opinions of such physicists as Guth and Vilenkin, the vast part of it that's due to inflation per se is no longer an accelerating one anywhere in our observable region. I know the analyses of variable stars by two competing teams concluded with the surprising fact of some recent (cosmologically speaking) acceleration, but a recent thread points out that (in spite of much media hype), it's pretty negligible so far and could be an illusion due to fields between us and those stars.
The acceleration being discussed is the acceleration of the expansion of the universe, and actually "velocity" is not quite the right term for what's happening unless you make it the phrase "recession velocity" so as to avoid confusion with local velocity which cannot exceed c.slatts said:Sorry, I'm not understanding how velocity necessarily results from any ongoing acceleration. Doesn't movement include direction and speed (-the only two components of velocity I can think of) even if it's relative to an object moving inertially (like my car, if I haven't depressed the gas pedal for awhile)?
akashpandey said:according to the theory universe is expanding and in space there is vacuum
So why it consist of idea gas law properties.
phinds said:Things at the edge of our observable universe are receding at about 3c which certainly is not even remotely possible inertially.
Interesting. Thanks.PeterDonis said:Be careful. What you actually mean here is "inertially in flat spacetime"; but the spacetime of the universe is not flat. The "recession velocity" of 3c is between comoving objects, and comoving objects are in free fall, so in that sense they are moving "inertially". They are just doing so in a curved spacetime in which the tidal gravity between them is sufficient to make freely falling objects at that separation have a relative "recession velocity" of 3c in comoving coordinates.
The universe is expanding refers to the continuous increase in the distance between galaxies and other celestial bodies. This expansion is happening at an accelerating rate, meaning the expansion is getting faster over time.
We know that the universe is expanding through various observations and experiments, such as the redshift of light from distant galaxies, the cosmic microwave background radiation, and the measurements of the Hubble constant.
The exact cause of the universe's expansion is still a mystery, but scientists believe that it is driven by a force called dark energy. This force is thought to make up about 70% of the total energy in the universe and is responsible for the accelerated expansion.
Based on current observations, the universe will continue to expand indefinitely. However, the rate of expansion may change over time, and some theories suggest that the universe could eventually stop expanding and begin to contract.
The expansion of the universe has several implications for its future. One of the most widely accepted theories is the "Big Rip" scenario, where the universe will eventually expand at such a rapid rate that it will tear apart all matter and even the fabric of space itself.