Why is space black?

Discuss celestial objects and phenomena outside the Earth's atmosphere, Earth-launched satellites and exploratory missions, etc....

Moderators: Calilasseia, ADParker

Re: Why is space black?

#61  Postby newolder » Dec 01, 2019 11:35 am

Here's a view of a patch of sky that contains no (possibly 1, 2 or 3 - a few?) Milky Way stars. Each dot is a galaxy and the colours are made by blue shifting the infrared light observed by the Herschel space telescope into the human-visible range.
Image

Link to related story
Geometric forgetting gives me loops. - Nima A-H
User avatar
newolder
 
Name: Albert Ross
Posts: 6537
Age: 8
Male

Country: Feudal Estate number 9
Print view this post

Ads by Google


Re: Why is space black?

#62  Postby Fallible » Dec 01, 2019 11:52 am

That is mental.
Sorry that you think you had it rough in the first world.
You ought to get out a map sooner than later.
Knowledge has turned into a trap; you have to slow down.
Get out of your head and spend less time alone.
User avatar
Fallible
RS Donator
 
Name: Alice Pooper
Posts: 49451
Age: 46
Female

Country: Engerland na na
Canada (ca)
Print view this post

Re: Why is space black?

#63  Postby Spearthrower » Dec 01, 2019 12:07 pm

Shows just how impoverishing mystification really is.
I'm not an atheist; I just don't believe in gods :- that which I don't belong to isn't a group!
Religion: Mass Stockholm Syndrome

Learn Stuff. Stuff good. https://www.coursera.org/
User avatar
Spearthrower
 
Posts: 25227
Age: 43
Male

Country: Thailand
Print view this post

Re: Why is space black?

#64  Postby newolder » Dec 01, 2019 12:18 pm

^ Here's one ... If they had properly de-mystified their telescope, we'd be able to see those things a bit clearer, eh? :guffaw: :guffaw: (Parka zipped and hooded up...)
Geometric forgetting gives me loops. - Nima A-H
User avatar
newolder
 
Name: Albert Ross
Posts: 6537
Age: 8
Male

Country: Feudal Estate number 9
Print view this post

Re: Why is space black?

#65  Postby Fallible » Dec 01, 2019 12:45 pm

:tehe:
Sorry that you think you had it rough in the first world.
You ought to get out a map sooner than later.
Knowledge has turned into a trap; you have to slow down.
Get out of your head and spend less time alone.
User avatar
Fallible
RS Donator
 
Name: Alice Pooper
Posts: 49451
Age: 46
Female

Country: Engerland na na
Canada (ca)
Print view this post

Re: Why is space black?

#66  Postby Macdoc » Dec 01, 2019 4:54 pm

we'd be able to see those things a bit clearer, eh?


right down to the licence plates.
Must say did not know there was a Herschel telescope....well deserved

Although her name isn’t as instantly recognisable as her brother William Herschel, Caroline’s contribution has been honoured many times over, including a Gold Medal from the Royal Astronomical Society in 1838 (another first for a woman), and has a comet, an asteroid, a crater on the Moon and a space telescope named after her.


https://www.sciencefocus.com/science/10 ... now-about/

https://public.nrao.edu/blogs/how-shall ... -herschel/
Travel photos > https://500px.com/macdoc/galleries
EO Wilson in On Human Nature wrote:
We are not compelled to believe in biological uniformity in order to affirm human freedom and dignity.
User avatar
Macdoc
 
Posts: 15915
Age: 72
Male

Country: Canada/Australia
Australia (au)
Print view this post

Re: Why is space black?

#67  Postby Spinozasgalt » Dec 01, 2019 10:15 pm

newolder wrote:Here's a view of a patch of sky that contains no (possibly 1, 2 or 3 - a few?) Milky Way stars. Each dot is a galaxy and the colours are made by blue shifting the infrared light observed by the Herschel space telescope into the human-visible range.
Image

Link to related story

Is it? Or is it a very patchy playground field of grass?
When the straight and narrow gets a little too straight, roll up the joint.
Or don't. Just follow your arrow wherever it points.

Kacey Musgraves
User avatar
Spinozasgalt
RS Donator
 
Name: Jennifer
Posts: 18179
Age: 32
Male

Country: Australia
Australia (au)
Print view this post

Ads by Google


Re: Why is space black?

#68  Postby laklak » Dec 01, 2019 10:22 pm

I think it's a close up of a microfibre throw pillow.
A man who carries a cat by the tail learns something he can learn in no other way. - Mark Twain
The sky is falling! The sky is falling! - Chicken Little
I never go without my dinner. No one ever does, except vegetarians and people like that - Oscar Wilde
User avatar
laklak
RS Donator
 
Name: Florida Man
Posts: 19717
Age: 65
Male

Country: The Great Satan
Swaziland (sz)
Print view this post

Re: Why is space black?

#69  Postby newolder » Dec 01, 2019 10:41 pm

Spinozasgalt wrote:
newolder wrote:Here's a view of a patch of sky that contains no (possibly 1, 2 or 3 - a few?) Milky Way stars. Each dot is a galaxy and the colours are made by blue shifting the infrared light observed by the Herschel space telescope into the human-visible range.
Image

Link to related story

Is it? Or is it a very patchy playground field of grass?


Is this one of those t'internet games I hear tell of?

Patchy grass:
Image

Is it? Or is it an open pesto sandwich?
Geometric forgetting gives me loops. - Nima A-H
User avatar
newolder
 
Name: Albert Ross
Posts: 6537
Age: 8
Male

Country: Feudal Estate number 9
Print view this post

Re: Why is space black?

#70  Postby CdesignProponentsist » Dec 02, 2019 8:12 pm

aufbahrung wrote:Space is stuff that isn't there.


I would contend that space is stuff that is virtually there. Space isn't the absence of anything, it has an underlying energy. There is stuff there. I would also say it is clear, as light travels through it with little to no decoherence.

The CMB which which we see through a mostly transparent space is black or very near black depending on your definition of black (visible or EM spectrum).
"Things don't need to be true, as long as they are believed" - Alexander Nix, CEO Cambridge Analytica
User avatar
CdesignProponentsist
 
Posts: 12480
Age: 52
Male

Country: California
United States (us)
Print view this post

Re: Why is space black?

#71  Postby newolder » Dec 02, 2019 9:07 pm

Sean Carroll:
"This year we give thanks for space.… Space is probably emergent rather than fundamental, and the ultimate answer to why it exists is probably going to involve quantum mechanics, and perhaps quantum gravity."


preposterousuniverse blog post, "Thanksgiving"
Geometric forgetting gives me loops. - Nima A-H
User avatar
newolder
 
Name: Albert Ross
Posts: 6537
Age: 8
Male

Country: Feudal Estate number 9
Print view this post

Re: Why is space black?

#72  Postby BWE » Dec 05, 2019 10:10 pm

aufbahrung wrote:Could be any color. But it tends towards black. Why?

It changes color when you shine a light on it.
User avatar
BWE
 
Posts: 2428

Print view this post

Re: Why is space black?

#73  Postby Ironclad » Dec 05, 2019 11:18 pm

Everything is black, until one has an eye.
:smoke:
For Van Youngman - see you amongst the stardust, old buddy

"If there was no such thing as science, you'd be right " - Sean Lock

"God ....an inventive destroyer" - Broks
User avatar
Ironclad
RS Donator
 
Name: Nudge-Nudge
Posts: 22975
Age: 50
Male

Country: Wink-Wink
Indonesia (id)
Print view this post

Re: Why is space black?

#74  Postby The_Metatron » Dec 06, 2019 1:08 am

Ironclad wrote:Everything is black, until one has an eye.
:smoke:

Just a goddamned minute, here!

That appears suspiciously like the tree falling in the woods when no one is around thing.


Sent from my iPad using Tapatalk Pro
I AM Skepdickus!

Check out Hack's blog, too. He writes good.
User avatar
The_Metatron
Moderator
 
Name: Jesse
Posts: 20628
Age: 56
Male

Country: United States
United States (us)
Print view this post

Re: Why is space black?

#75  Postby Hermit » Dec 06, 2019 2:27 am

aufbahrung wrote:Could be any color. But it tends towards black. Why?

To my untutored mind there is no mystery about it. You get black when no light is being reflected. Now, firstly, while not even space is a perfect vacuum, there is precious little to reflect light. Secondly, as the distance between light and its source increases, the stream of photons gets less dense. So, not only is there precious little to reflect light in space, but there also is precious little light at all. Stars are a relatively powerful light source, but when there are tens, hundreds or tenthousands of light years between them, there is more space to light up than they have the capacity for. Thirdly, our eyes are not particularly sensitive to light. The night vision of cats, for example, is six times better than that of humans. Also our frequency range is radically limited. Everything the other side of violet at one end of the spectrum and red on the other looks black to us. Those frequencies are there. We just can't detect them with our eyes.

Image
God is the mysterious veil under which we hide our ignorance of the cause. - Léo Errera


God created the universe
God just exists
User avatar
Hermit
 
Posts: 2589
Age: 66
Male

Country: Here
Print view this post

Ads by Google


Re: Why is space black?

#76  Postby Ironclad » Dec 06, 2019 10:57 am

The_Metatron wrote:
Just a goddamned minute, here!


LOL! Do all you Americans talk like John Wayne? :lol:
For Van Youngman - see you amongst the stardust, old buddy

"If there was no such thing as science, you'd be right " - Sean Lock

"God ....an inventive destroyer" - Broks
User avatar
Ironclad
RS Donator
 
Name: Nudge-Nudge
Posts: 22975
Age: 50
Male

Country: Wink-Wink
Indonesia (id)
Print view this post

Re: Why is space black?

#77  Postby Cito di Pense » Dec 06, 2019 12:05 pm

Ironclad wrote:
The_Metatron wrote:
Just a goddamned minute, here!


LOL! Do all you Americans talk like John Wayne? :lol:


If you have to talk to a philosopher, talking like John Wayne is a winning strategy.
Хлопнут без некролога. -- Серге́й Па́влович Королёв

Translation by Elbert Hubbard: Do not take life too seriously. You're not going to get out of it alive.
User avatar
Cito di Pense
 
Name: Amir Bagatelle
Posts: 28549
Age: 22
Male

Country: The Heartland
Mongolia (mn)
Print view this post

Re: Why is space black?

#78  Postby BlackBart » Dec 06, 2019 2:29 pm

The hell it is.
You don't crucify people! Not on Good Friday! - Harold Shand
User avatar
BlackBart
 
Posts: 11771
Age: 57
Male

United Kingdom (uk)
Print view this post

Re: Why is space black?

#79  Postby Ironclad » Dec 06, 2019 2:37 pm

Get off your (high) house, an' drink ya milk, cowboy.
For Van Youngman - see you amongst the stardust, old buddy

"If there was no such thing as science, you'd be right " - Sean Lock

"God ....an inventive destroyer" - Broks
User avatar
Ironclad
RS Donator
 
Name: Nudge-Nudge
Posts: 22975
Age: 50
Male

Country: Wink-Wink
Indonesia (id)
Print view this post

Re: Why is space black?

#80  Postby Cito di Pense » Dec 06, 2019 2:45 pm

Ironclad wrote:Get off your (high) house, an' drink ya milk, cowboy.


What is a high house? Is that some new slang for a hashish parlor? Me?

I'm gonna take my horse to the old town road, gonna ride, till I can't no more...
Хлопнут без некролога. -- Серге́й Па́влович Королёв

Translation by Elbert Hubbard: Do not take life too seriously. You're not going to get out of it alive.
User avatar
Cito di Pense
 
Name: Amir Bagatelle
Posts: 28549
Age: 22
Male

Country: The Heartland
Mongolia (mn)
Print view this post

PreviousNext

Return to Astronomy & Space Science

Who is online

Users viewing this topic: No registered users and 1 guest