Is a greenish moon possible??
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04-05-2015, 08:54 AM
RE: Is a greenish moon possible??
(04-05-2015 08:44 AM)Bows and Arrows Wrote:  isnt there a way to green with angles of light? kind of like there is a flash of green when the sun sets, its a "bend" in the light rays....or something like that --I don't have enough coffee in my system to properly think thru.

kwim?

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04-05-2015, 10:56 AM
RE: Is a greenish moon possible??
(03-05-2015 08:21 PM)Erikjust Wrote:  At the same time the planet has 3 moons (wonder how the orbit would look) and the green one is described as dim, which probably means it´s furthest away.

No. They would all be reflecting the light from whichever star they orbit. If they're close enough to orbit a slightly larger than earth sized planet, even the farthest one wouldn't be much farther than the closest in astronomical terms. Certainly not far enough to make it noticeability dimmer than the others. It would be more likely that the surface is simply less reflective.

If the moon is large enough to hold even a small atmosphere, it may be able to support lifeforms that exist very close to the ground... Moss-like perhaps.

Another possibility is that the moon could have ocean life, and that the oceans remain liquid through tidal/gravitational forces warping the moon and keeping the core warm. But that might require a larger planet, and I'd expect it to reflect more light.
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04-05-2015, 11:23 AM
RE: Is a greenish moon possible??
Quote:The question is however could a moon orbiting around a planet the size of the Earth ever be big enough, for it´s gravity to be strong enough to hold oxygen?

Does size really matter in this case?
As long as the mass/density is high enough, gravity will be there.
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06-05-2015, 10:37 AM
RE: Is a greenish moon possible??
(04-05-2015 11:23 AM)pablo Wrote:  
Quote:The question is however could a moon orbiting around a planet the size of the Earth ever be big enough, for it´s gravity to be strong enough to hold oxygen?

Does size really matter in this case?
As long as the mass/density is high enough, gravity will be there.

I guess not i just thought that a moon had to be a certain size to have enough mass/density to hold enough gravity to hold an atmosphere.
And that such a moon would be too large to orbit a planet earth size, at least long enough for intelligent life to evolve.

But i wonder if the moon was mainly made out of greenish minerals like Actinolite, Chlorite, Epidote and other such materials we know to be greenish to the naked eye, would it shine darkly green or bright green, if watched from the surface of the planet?
Or is a green glow only possible if there were an atmosphere on the planet and it had greenish vegetation on it?
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09-05-2015, 11:28 AM
RE: Is a greenish moon possible??
(04-05-2015 11:23 AM)pablo Wrote:  
Quote:The question is however could a moon orbiting around a planet the size of the Earth ever be big enough, for it´s gravity to be strong enough to hold oxygen?

Does size really matter in this case?
As long as the mass/density is high enough, gravity will be there.

Maybe the inhabitants of the planet could only see in the green wavelengths of the spectrum? Or have an atmosphere that absorbs all wavelengths, except green. (It would be a very warm planet!)
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09-05-2015, 12:27 PM
RE: Is a greenish moon possible??
(09-05-2015 11:28 AM)Timj Wrote:  
(04-05-2015 11:23 AM)pablo Wrote:  Does size really matter in this case?
As long as the mass/density is high enough, gravity will be there.

Maybe the inhabitants of the planet could only see in the green wavelengths of the spectrum? Or have an atmosphere that absorbs all wavelengths, except green. (It would be a very warm planet!)

If you were always only capable of seeing in the 500-560 nm spectrum, you wouldn't say everything is green... Depending on how your senses were evolved, you would likely have names for the variations of hue.

Another way of looking at it, if an alien species were able to see a 100x greater range of light wavelengths than a human, they may "see" everything from 400 nm through 750 nm as a variations of (alien color X)... doesn't mean we only see that one color between those wavelengths. Instead, we divide those into everything from purple, through blue, green, yellow, red.. So while to that alien species, we can only see in shades of (alien color X), we would never describe everything we see as one color.
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15-05-2015, 06:02 AM
RE: Is a greenish moon possible??
(03-05-2015 07:18 PM)pablo Wrote:  Perhaps it was originally part of a larger body and was split off in a collision (like the proposed creation of the earth's moon) and was captured by the planet it now orbits.

This could easily allow for a hypothetical moon around a hypothetical planet to be any shade of any color you like. The galaxy is a big place, not to mention the universe. Of all the things that science fiction gets wrong, I don't think we have to worry about the color of moons.

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23-05-2015, 05:50 PM
RE: Is a greenish moon possible??
(03-05-2015 07:18 PM)pablo Wrote:  
(03-05-2015 06:05 PM)unfogged Wrote:  Maybe it's high in copper; doesn't Mars look reddish because of a high iron content?

Copper turns green when it oxidizes, no oxygen on the Moon.

Hmmm, I believe that copper oxides tend to be red, brownish or black, actually. The greenish copper patina is caused by other reactions, like with salts to form copper chloride, CO2 to form copper carbonate etc. Some minerals containing copper are green too.

As a side note, it may be worth pointing out that there is a lot of oxygen on the Moon, it is just tied up as minerals and compounds.
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07-06-2015, 09:42 PM
RE: Is a greenish moon possible??
(09-05-2015 12:27 PM)WeAreTheCosmos Wrote:  If you were always only capable of seeing in the 500-560 nm spectrum, you wouldn't say everything is green... Depending on how your senses were evolved, you would likely have names for the variations of hue.

Another way of looking at it, if an alien species were able to see a 100x greater range of light wavelengths than a human, they may "see" everything from 400 nm through 750 nm as a variations of (alien color X)... doesn't mean we only see that one color between those wavelengths. Instead, we divide those into everything from purple, through blue, green, yellow, red.. So while to that alien species, we can only see in shades of (alien color X), we would never describe everything we see as one color.


Relative to we humans, they would only see in green. Everything is relative to the observer. (:
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08-06-2015, 05:41 AM
RE: Is a greenish moon possible??
(07-06-2015 09:42 PM)Timj Wrote:  
(09-05-2015 12:27 PM)WeAreTheCosmos Wrote:  If you were always only capable of seeing in the 500-560 nm spectrum, you wouldn't say everything is green... Depending on how your senses were evolved, you would likely have names for the variations of hue.

Another way of looking at it, if an alien species were able to see a 100x greater range of light wavelengths than a human, they may "see" everything from 400 nm through 750 nm as a variations of (alien color X)... doesn't mean we only see that one color between those wavelengths. Instead, we divide those into everything from purple, through blue, green, yellow, red.. So while to that alien species, we can only see in shades of (alien color X), we would never describe everything we see as one color.


Relative to we humans, they would only see in green. Everything is relative to the observer. (:

Yeah but as I already explained, 'they' wouldn't describe it as 'green', especially if EVERYTHING they see is green.
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