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Alas the sun is not immortal. In all probability it will get a lot hotter before it dies, but it won't disappear.The fact that it is generally colder at night than during the day is due to the fact that Earth's radiation to the rest of the universe is greater than the incoming power from distant stars, so we would certainly cool down if the sun didn't shine. Not to absolute zero, however, or even cosmic background temperature, as a significant fraction of the surface heat comes from internal nuclear disintegrations.
we radiate out to the stars is equal to they radiate in. the outer atmosphere is very cold, it can only radiate out tiny heat from earth, as tiny as stars radiate in.agree?
Quote from: jccc on 08/07/2015 18:44:27we radiate out to the stars is equal to they radiate in. the outer atmosphere is very cold, it can only radiate out tiny heat from earth, as tiny as stars radiate in.agree?No.
are their view of energy and photon correct?no matter how big is the antenna, the out put power is limited, 1000 light years? we can hardly see the stars with best tools, to get radio communication? obviously, they find no lives within 1000 light years so far?
The best estimate I have seen is that the surface of the earth will cool to about 30°K much the same as the Kuiper belt objects maintained by radio active decay of the core.jcccThe SETI people say that with Arecibo size antennas communication should be possible to 1000 LY,s
where all the light from all stars go? vanished into space?