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Author Topic: If our sun suddenly vanished, will earth get colder?  (Read 4029 times)

Offline jccc

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i think if sun suddenly vanished, all planets will spread out follow their own path. moon will still orbiting us.

we will have star lights only, see no moon, day is night. but we will not get colder.

heat radiation within the atmosphere will stay same strength/amount, radiate out to far stars is equal to they radiate in.     

without sun light, food chain is gone, life will be end, all organic will oxidize, decompose and return to matter.   

kind of waste time, cus the sun has no interest to vanish, it loves us, it is immortal.
« Last Edit: 08/07/2015 10:28:38 by chris »


 

Offline evan_au

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #1 on: 08/07/2015 11:40:39 »
In this hypothetical scenario, it is not clear if the Sun vanished because it moved to a different part of the galaxy, or it disappeared because someone put something between the Earth & Sun, which reflects or absorbs the Sun's light (only slightly less unlikely than the first scenario).

If the Sun's light does not reach the Earth (because the Sun has moved, or because the light is being reflected away), the Earth will start to cool, just as if the Sun had set. But instead of starting to warm up again at dawn the next day, it will continue to get colder and colder (probably with a slight pause as any open bodies of water freeze over).

On the other hand, if a thin absorbent barrier is placed between the Earth and Sun, it will quickly warm up to the black-body temperature of its location, and then re-radiate this heat towards the Earth. It will slow the rate of cooling compared to a reflective barrier. However, the much longer wavelengths of this radiation will not support photosynthesis.

If the Sun is still present (but not visible), the planets will continue on their elliptical orbits.
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #2 on: 08/07/2015 15:44:18 »
so according to you, if there is only 1 sun in the universe, it will get colder and colder till 0 K?

where those energy/photons go? vanished into space?

is energy conservation law not working?
 

Offline alancalverd

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #3 on: 08/07/2015 17:21:36 »
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.
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #4 on: 08/07/2015 18:29:46 »
that's acceptable to a point.

where all the light from all stars go? vanished into space?

is energy conservation law only works till all suns die out?
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #5 on: 08/07/2015 18:44:27 »
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?
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #6 on: 08/07/2015 20:45:26 »
heat/light/energy radiation is a vibration force, it can only stored within atoms vibration.

the stronger vibration force within the matter the higher temperature.

all stars/planets have a hotter core due to the bounding strength/pressure of the atom in the core is stronger, those atoms vibration force is stronger.

i am not 100% sure yet, thinking made my gray hair turning dark, believe me or not.
 

Offline alancalverd

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #7 on: 08/07/2015 23:59:38 »


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?

No.
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #8 on: 09/07/2015 00:39:49 »


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?

No.

then where the energy/photons go? vanished in darkness?
 

Offline diethyl

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #9 on: 09/07/2015 09:42:18 »
There have biology living without light. Like some microorganism.

So, even our sun suddenly vanished, we will find another way to survive, although it will be a long process.

BUT! It's too much terrible!
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #10 on: 09/07/2015 14:37:34 »
we can grow using artificial lights.

pole area without sunlight 6 months in winter, people survived.
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #11 on: 09/07/2015 17:39:55 »
the nearest star is 4 light years away, if people like us live on a planet orbiting that star send message to us, we won't be able to get it. think about how dime is the star light that powered by the whole star?

according to physics laws we knew/proved, we can't even send a light beam to them that is detectable to them. 

if life is everywhere, it is separated by distance too far to reach. we are alone, don't fight.

 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #12 on: 09/07/2015 17:58:47 »
i see 2 forms of force in nature. static force such as gravity keeps things in order, such as attract matter into sphere, keep planets in orbits.

vibration force such as gravitational radiation transfers energy. energy/vibration force is always at moving at c speed, it can never stop, it can only exist within atoms vibrations.

where matter and energy came from? how matter and energy evolved into life? or life is first? i eager to learn.
 

Online syhprum

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #13 on: 09/07/2015 20:43:12 »
The best estimate I have seen is that the surface of the earth will cool to about 30K much the same as the Kuiper belt objects maintained by radio active decay of the core.

jccc

The SETI people say that with Arecibo size antennas communication should be possible to 1000 LY,s
« Last Edit: 09/07/2015 20:48:52 by syhprum »
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #14 on: 09/07/2015 23:20:03 »
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?
 

Offline chiralSPO

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #15 on: 10/07/2015 00:22:01 »
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?

A) we can easily see stars 1000 light years away with our eyes, and with our best tools, we can see over 10000000000 light years away.

B) it's easier to send high powered radio signals than with visible light (less energy for same intensity, and less interference from stars)
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #16 on: 10/07/2015 00:41:22 »
4 light years away already a tiny dot. 1000 light years away? the tiny dot maybe a galaxy.

compare our radio range and power, increase the out put power, see how far it can go. 1000 light years away? I doubt.
 

Offline chiralSPO

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #17 on: 10/07/2015 00:43:37 »
Betelguese is one of the brighter stars in the constellation Orion. It is more than 600 light years away.
 

Offline jccc

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #18 on: 10/07/2015 05:15:59 »
The best estimate I have seen is that the surface of the earth will cool to about 30K much the same as the Kuiper belt objects maintained by radio active decay of the core.

jccc

The SETI people say that with Arecibo size antennas communication should be possible to 1000 LY,s

what's on SETI peoples minds?

" hello, hello, we earth scientists, how are you star people?"   wait 1000 years for a message like

"haha,haha, we star sheeper, we don't like people"
 

Offline evan_au

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #19 on: 10/07/2015 10:27:59 »
Quote from: jccc
where all the light from all stars go? vanished into space?
This question has been raised by many astronomers over the years, starting with Kepler around 1610, with contributions from Halley & Olbers, among others. This question is commonly called "Olber's Paradox".

The common explanation is based on the observed expansion of the universe red shifting starlight, making the light from distant stars invisible. This answer became possible following the measurement of red shifts by Edwin Hubble.

Other explanations are also available.
 

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Re: If our sun suddenly vanished, will earth get colder?
« Reply #19 on: 10/07/2015 10:27:59 »

 

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