Re: Arrow of time

Dr Umesh Bilagi wrote in talk.origins

On May 3, 11:11 am, "Ross Langerak" <rlange...@xxxxxxxxxxxxx> wrote:
Applied to the formation of a star and planets, a cloud of dust and gas
collapses under its own gravity. Potential energy is turned into
kinetic energy and then heat. The hot star and planets radiate heat
out into the cold Universe. This represents an increase in entropy.
To reverse this - to return the system to a diffuse cloud of dust and
gas - would require an input of work. The cloud of dust and gas is the
low entropy condition; the planetary system is the high entropy
condition.

ALL the heat produced formation gets dispeated if then why core of
earth is still hot

as someone else said, nuclear decay. On an historical note, one famous
scientist,Lord Kelvin, over a hundred years ago, calculated the age of the
earth based on rate of cooling. His first estimate was about 98 million
years, then revised to 20 million years. This was before the discovery of
nuclear decay.
And nuclear decay releases heat, lots of it. And that heat is why the
earth's core is so hot, and why the sun is so hot.

I may asking very useless question please tell me

Not at all. Sometimes the answers are a little hard to find, and you never
learn if you don't ask.

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