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/sci/ - Science & Math

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4971193 No.4971193 [Reply] [Original]

Planets are science related. Help me /sci/

How do I go about figuring out what t he color of a planets surface, or atmosphere would be based on its composition? ie we know mars has a red surface because of the iron oxide. How would I know what a planets atmosphere is mainly composed of if it were a green? etc

this is important

>> No.4971194

If it's green, then there are always algae in the atmosphere

>> No.4971199

>>4971194
What about the rest of the spectrum?

>> No.4971220

>>4971194
An atmosphere of Chlorine would be green.

>> No.4971230

>>4971220
Is chlorine the only element that would cause a green atmosphere?

>> No.4971243

>>4971230
Just look up pigment on wikipedia or something. That'll give you an idea of the varieties of colours caused by elements.

For instance, copper might make a planet green, though I don't know how it would get in the atmosphere.

>> No.4971244

>>4971243
I'll check it out

>> No.4971246

>>4971244
Be aware that I'm completely full of shit and that might not help.

But it's probably better than asking /sci/

>> No.4971248

>>4971246
Somebody here must know something about atmospheric or planetary composition

>> No.4971250

>How would I know what a planets atmosphere is mainly composed of if it were a green?
You would take a spectrum. Spectrographs are used all the time in astronomy. Analysing the spectrum can tell you about the composition.

>> No.4971251
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4971251

>>4971248
Ashes to ashes, dust to dust.
Also air.
Hope this helps.

>> No.4971255

>>4971250
So then what would I do if the I can't actually take a spectrum because I'm the one whos making the planet.

>> No.4971260

a planets color depends on it's parent star's composition and spectrum as well


not enough data

>> No.4971263

>>4971262
Nope sorry, just ate.

>>4971260
Well thats why I'd rather know what elements make what colors so I can make the planet out of those elements and give them the right colors.

>> No.4971262
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4971262

>>4971255
You are now hungry.

>> No.4971267

>>4971263

right...like i said.

whatever your light source is, in part, determines the color of an observed object

a B class star would make an object it illuminates a certain color, while the same object illuminated by a M class star a different color.

what's not to understand?

>> No.4971271

>>4971267
>what's not to understand?
My original question apparently. The color of an atmosphere or planet is not solely based on the color from the star, and that is not anywhere near what I was originally asking. Why in the fuck would you bring it up? This is a thread about the composition of planets and how THAT affects their colors.

>> No.4971273

>>4971267
The temperature also matters.

>> No.4971277

>>4971271
On earth some of the light from the infrared spectrum (in comparison to the light from the sun) would be missing due to plants.

>> No.4971280

>>4971271
oh right...i forgot...

you're planet is visible without a light source

gotcha

>> No.4971281

>>4971280
And your planet exists without elements to make it up

neat

>> No.4971282

>>4971280
>you're

>> No.4971286

>>4971280
>>4971281
It's a combination of both obviously.
You need something to compare the spectrum to which is the light source.
The elements just reflect and absorb light from that source.

>> No.4971287
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4971287

ITT:knowing the light source overrides knowing the elements in the atmospher vs. the reverse

here we go

>> No.4971288

>>4971286
What if the light source is pure white

>> No.4971291

>>4971288
That just makes it easier.
Or atleast way more accurate.

>> No.4971290

>>4971271
look here fucktard...
the color of an atmosphere and the color of a planet (and constituent components) are two very different things with several variables between them besides

pick one or the other or be ready to account for the light source used to observe each

it's actually important

>> No.4971293

>>4971286
>The elements just reflect and absorb light from that source.


you see this /sci/? you see this?

this is a true ass nigga.

>> No.4971292

>>4971290
Are you saying I can't pick both independently of eachother?

>> No.4971295

>>4971293
u wot m8

>> No.4971296

...are we assuming human observers?

or like something closer to mantis shrimp?

>> No.4971299

is anon 2 saying you need to know what the light source is so that you can calibrate any spectrum analyzing?

>> No.4971300

>>4971296
>implying wave lengh change because of observator

>> No.4971301
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4971301

>>4971296

>> No.4971298
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4971298

>>4971296
this is absurd

>> No.4971302

>>4971300
>implying they don't

learn2superposition

>> No.4971306

>>4971302
>implying they do in the context described by OP

learn2comprehension

>> No.4971338

Colorimetry is a fickle mistress is all i'm saying

>> No.4971529

bvump

>> No.4971534
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4971534

>>4971306
>context
>implying theories aren't defined by being applied in any context

>> No.4971543

http://en.wikipedia.org/wiki/Astronomical_spectroscopy

your welcome

>> No.4971546

what the hell happened in here? THere's a great picture of what sunset would look like from the surface of saturn, it was green.

>> No.4971556
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4971556

>>4971546
All I got is this

>> No.4971554

>>4971543
Thanks, though it seems to be odd that there are so few recorded chemicals on the list. Oh well

>> No.4971560

>>4971556
is that sunset from mars ?

>> No.4971561

>>4971560
yes

>> No.4971570

>>4971561
worst thing about mars ios that it looks as hot as sahara but it's fucking cold

>> No.4971571

>>4971569
yup

>> No.4971569

>>4971556
False color.
Meaning it is black and white and then the kindergarteners at NASA colored it in.

>> No.4971642

>>4971569

Er, no. It is indeed false color, but 'red', 'green', and 'blue' are the light received on the 750 nm, 530 nm, and 430 nm filters on the MER Pancam. Those pretty well approximate the peak response wavelengths for the cones in our eyes, except for the 'red', which is highly exaggerated in the picture. No kindergartners involved.

>> No.4971671
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4971671

>>4971642
You're fuckin' with me.

>> No.4971688
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4971688

colors, yo.

>> No.4971700

>>4971671
No, just trying to be informative. See the link below if you don't believe me.

http://marsrovers.jpl.nasa.gov/gallery/press/spirit/20050610a.html

>> No.4971724

The sky on mars is blueish pink.

The sky on earth is blue because the water reflects its blue into the sky.

>> No.4971741

>>4971724
hurr

>> No.4971788
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4971788

17 years of professional photo lab experience, 18 years in the broadcast TV biz reporting:

Remember, when looking at most media you are really looking at a blend of three colors, or some variation of that. The phosphors (filters on an LCD) on a monitor are red, green and blue. All other colors are approximated by mixing these. This is called additive color. Some modern LED displays add yellow to the mix, which is normally provided by mixing equal parts of red and green light.

Subtractive color, used in print, uses the photographic secondaries, cyan (opposite of red), magenta (opposite of green) and yellow (opposite of blue) on white paper. This is how old-school photographic print media works. Ink printing (offset and similar) adds black to the mix. Modern ink-jet printers add shades of the secondaries plus levels of gray.

"Pure white" is subjective. What we see as "white" might be offset to one color or another depending on the species perceiving the light. We always have to consider our personal frame of reference, the instruments we are provided with, our eyes and brain. We adjust artificial instrumentalities to reproduce what we think a scene ought to look like, so we are comfortable with it from our vantage point.

>> No.4971791

>>4971788
kill yourself

>> No.4971802

>>4971791
sure is summer in here

>> No.4971816
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4971816

>>4971791
no need to be upset. Everything he said is perfectly correct. Color perception and fidelity is a very involved topic.

>>4971724
The sky is blue and sun is yellow because dust in the atmosphere preferentially scatters blue light. Fun fact: reflection nebulas are blue for exactly the same reason.

>> No.4971854

>>4971802
>>4971816
kill yourself

>> No.4971863

a little every day son....don't we all?