What is the temperature of the black night sky, outside the atmosphere?What is the temperature of the clear night sky from the surface of Earth?Temperature of a black-body in LEO on the dark side of the EarthIf quantum gas goes below 0K, is calling 0K absolute zero irrelevant?What do the line segments on the BICEP2 B-mode polarization map mean?Why is the sky dark at night?How do we filter out radiation from galaxies from the cosmic background radiation?At any given point in the universe, are there a huge number of photons crossing paths?By how much does starlight heat the Earth?Would time dilation affect temperature?How much does temperature affect the time of sunrise?How did Edwin Hubble estimate the velocity of distant stars?
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What is the temperature of the black night sky, outside the atmosphere?
What is the temperature of the clear night sky from the surface of Earth?Temperature of a black-body in LEO on the dark side of the EarthIf quantum gas goes below 0K, is calling 0K absolute zero irrelevant?What do the line segments on the BICEP2 B-mode polarization map mean?Why is the sky dark at night?How do we filter out radiation from galaxies from the cosmic background radiation?At any given point in the universe, are there a huge number of photons crossing paths?By how much does starlight heat the Earth?Would time dilation affect temperature?How much does temperature affect the time of sunrise?How did Edwin Hubble estimate the velocity of distant stars?
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The sky at night is rather black. If it were completely black, it would correspond to a black body at absolute zero. But the sky is not completely black. Is there a way to assign a temperature value to the actual black night sky?
The question is not about the temperature of the air of the atmosphere, nor that of the stars in the sky. The question is about the the temperature that corresponds to the blackness seen by, say, the Hubble telescope; the question is about the pure blackness of the night sky, between the stars, outside the atmosphere of the Earth.
Nela
cosmology temperature cosmic-microwave-background
asked Apr 30 at 20:03
NelaNela
184
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add a comment |
$begingroup$
The sky at night is rather black. If it were completely black, it would correspond to a black body at absolute zero. But the sky is not completely black. Is there a way to assign a temperature value to the actual black night sky?
The question is not about the temperature of the air of the atmosphere, nor that of the stars in the sky. The question is about the the temperature that corresponds to the blackness seen by, say, the Hubble telescope; the question is about the pure blackness of the night sky, between the stars, outside the atmosphere of the Earth.
Nela
cosmology temperature cosmic-microwave-background
asked Apr 30 at 20:03
NelaNela
184
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Sort of related: physics.stackexchange.com/questions/153839/…
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– PM 2Ring
May 1 at 10:58
add a comment |
$begingroup$
The sky at night is rather black. If it were completely black, it would correspond to a black body at absolute zero. But the sky is not completely black. Is there a way to assign a temperature value to the actual black night sky?
The question is not about the temperature of the air of the atmosphere, nor that of the stars in the sky. The question is about the the temperature that corresponds to the blackness seen by, say, the Hubble telescope; the question is about the pure blackness of the night sky, between the stars, outside the atmosphere of the Earth.
Nela
cosmology temperature cosmic-microwave-background
asked Apr 30 at 20:03
NelaNela
184
$endgroup$
The sky at night is rather black. If it were completely black, it would correspond to a black body at absolute zero. But the sky is not completely black. Is there a way to assign a temperature value to the actual black night sky?
The question is not about the temperature of the air of the atmosphere, nor that of the stars in the sky. The question is about the the temperature that corresponds to the blackness seen by, say, the Hubble telescope; the question is about the pure blackness of the night sky, between the stars, outside the atmosphere of the Earth.
Nela
cosmology temperature cosmic-microwave-background
cosmology temperature cosmic-microwave-background
asked Apr 30 at 20:03
NelaNela
184
asked Apr 30 at 20:03
NelaNela
184
edited May 1 at 18:06
Nela
asked Apr 30 at 20:03
NelaNela
184
asked Apr 30 at 20:03
NelaNela
184
asked Apr 30 at 20:03
NelaNela
184
184
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– PM 2Ring
May 1 at 10:58
add a comment |
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– PM 2Ring
May 1 at 10:58
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Sort of related: physics.stackexchange.com/questions/153839/…
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– PM 2Ring
May 1 at 10:58
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– PM 2Ring
May 1 at 10:58
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1 Answer
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It depends on what you mean by “sky”. The Earth’s atmosphere has a large range of temperatures at various altitudes, generally getting colder and colder from the surface temperature as you go up.
If what you are actually asking is the temperature of deep space, then it is 2.725 K, the temperature of the cosmic microwave background (CMB), a remnant of the Big Bang that permeates the entire universe. Every cubic centimeter of space has about 400 microwave-frequency photons with the spectrum of a 2.725 K blackbody. This radiation from about 380,000 years after the Big Bang is now very cold (just three degrees above abdolute zero) because the universe has expanded tremendously since then.
The CMB was predicted in 1948 and detected in 1964 by scientists who didn’t know about the prediction and weren’t looking for it.
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
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– ACuriousMind♦
May 1 at 22:31
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1 Answer
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1 Answer
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$begingroup$
It depends on what you mean by “sky”. The Earth’s atmosphere has a large range of temperatures at various altitudes, generally getting colder and colder from the surface temperature as you go up.
If what you are actually asking is the temperature of deep space, then it is 2.725 K, the temperature of the cosmic microwave background (CMB), a remnant of the Big Bang that permeates the entire universe. Every cubic centimeter of space has about 400 microwave-frequency photons with the spectrum of a 2.725 K blackbody. This radiation from about 380,000 years after the Big Bang is now very cold (just three degrees above abdolute zero) because the universe has expanded tremendously since then.
The CMB was predicted in 1948 and detected in 1964 by scientists who didn’t know about the prediction and weren’t looking for it.
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
$endgroup$
$begingroup$
Comments are not for extended discussion; this conversation has been moved to chat.
$endgroup$
– ACuriousMind♦
May 1 at 22:31
add a comment |
$begingroup$
It depends on what you mean by “sky”. The Earth’s atmosphere has a large range of temperatures at various altitudes, generally getting colder and colder from the surface temperature as you go up.
If what you are actually asking is the temperature of deep space, then it is 2.725 K, the temperature of the cosmic microwave background (CMB), a remnant of the Big Bang that permeates the entire universe. Every cubic centimeter of space has about 400 microwave-frequency photons with the spectrum of a 2.725 K blackbody. This radiation from about 380,000 years after the Big Bang is now very cold (just three degrees above abdolute zero) because the universe has expanded tremendously since then.
The CMB was predicted in 1948 and detected in 1964 by scientists who didn’t know about the prediction and weren’t looking for it.
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
$endgroup$
$begingroup$
Comments are not for extended discussion; this conversation has been moved to chat.
$endgroup$
– ACuriousMind♦
May 1 at 22:31
add a comment |
$begingroup$
It depends on what you mean by “sky”. The Earth’s atmosphere has a large range of temperatures at various altitudes, generally getting colder and colder from the surface temperature as you go up.
If what you are actually asking is the temperature of deep space, then it is 2.725 K, the temperature of the cosmic microwave background (CMB), a remnant of the Big Bang that permeates the entire universe. Every cubic centimeter of space has about 400 microwave-frequency photons with the spectrum of a 2.725 K blackbody. This radiation from about 380,000 years after the Big Bang is now very cold (just three degrees above abdolute zero) because the universe has expanded tremendously since then.
The CMB was predicted in 1948 and detected in 1964 by scientists who didn’t know about the prediction and weren’t looking for it.
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
$endgroup$
It depends on what you mean by “sky”. The Earth’s atmosphere has a large range of temperatures at various altitudes, generally getting colder and colder from the surface temperature as you go up.
If what you are actually asking is the temperature of deep space, then it is 2.725 K, the temperature of the cosmic microwave background (CMB), a remnant of the Big Bang that permeates the entire universe. Every cubic centimeter of space has about 400 microwave-frequency photons with the spectrum of a 2.725 K blackbody. This radiation from about 380,000 years after the Big Bang is now very cold (just three degrees above abdolute zero) because the universe has expanded tremendously since then.
The CMB was predicted in 1948 and detected in 1964 by scientists who didn’t know about the prediction and weren’t looking for it.
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
edited Apr 30 at 20:24
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
answered Apr 30 at 20:11
G. SmithG. Smith
12.4k12042
12.4k12042
$begingroup$
Comments are not for extended discussion; this conversation has been moved to chat.
$endgroup$
– ACuriousMind♦
May 1 at 22:31
add a comment |
$begingroup$
Comments are not for extended discussion; this conversation has been moved to chat.
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– ACuriousMind♦
May 1 at 22:31
$begingroup$
Comments are not for extended discussion; this conversation has been moved to chat.
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– ACuriousMind♦
May 1 at 22:31
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Comments are not for extended discussion; this conversation has been moved to chat.
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– ACuriousMind♦
May 1 at 22:31
add a comment |
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– PM 2Ring
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