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When you look at the intensity of the moon as it goes through its phases, you expect there to be more moonlight when the moon is full - obviously, since the "disk" of light is bigger. It is perfectly possible for @Rahul Grey is achromatic - colourless.
Therefore it appears that a plausible explanation is nothing more than that the two spectra below are insufficiently different for our eyes to perceive them as differently coloured. @Rob: There is no such thing as grey light, but there is such a thing as a grey object. Similarly, elements do not have some intrinsic colour, and they are not emitting "grey" light. And I will make it clear what the photographs show in my answer. Also note that the scale is linear.
The saturated photo shows this and a discerning eye can perceive the light color tint in the non-saturated photo.To subscribe to this RSS feed, copy and paste this URL into your RSS reader.
On this basis, the spectrum of the moon could be considered pinkish, as the reflectance of sunlight (which appears almost white to the human eye) is twice as effective at red wavelengths than blue.
The answer can only be that the lunar spectrum is close enough to (what we perceive as) white that we are unable to see it as coloured.The apparent magnitude of the brightest star is dim (Sirius at -1.4) compared to the Moon at -12.
So is Antares ("not Mars"), as is Betelgeuse. A shade of white. The best answers are voted up and rise to the top Those two spectra would be much closer to one another had intensity been placed on a logarithmic scale.In this answer you say "could be considered pinkish", but conclude that the spectrum is "close enough" to be called white.
There are two effects in play:This second point explains the really sharp peak right around full moon - and this is why the moon looks particularly bright and white at that time (barring atmospheric effects).This is described in more depth (and I just discovered it has a name: See also this image I took, it does not appear white, one of the seas looks blue.
When you are outside looking in, you are no longer adapted to that white point.It is not the integrated magnitude that matters is it?
"It isn't, it is (something), but it appears like that because (something)"@HarryCBurn No, it is not a "different colour". All three are orders of magnitude less luminous than is the Moon.
The transmission properties of the Earth's atmosphere on the apparent colour of the moon are very small compared to the reflectance spectrum which is heavily weighted towards the red. Apollo astronauts described its colour as ‘brownish’. Walk outside and look at the window of the room. The lighter color rocks are usually plagioclase feldspar, while the darker rocks are pyroxene.During the day, the Moon has to compete with sunlight, which is also being scattered by the atmosphere, so it looks white.Gray is not a color - it is a shade. However, much of the lunar surface contains minerals that are naturally grey and these dominate the colour we perceive from Earth.Discover our latest special editions covering a range of fascinating topics from the latest scientific discoveries to the big ideas explained.Listen to some of the brightest names in science and technology talk about the ideas and breakthroughs shaping our world.
If it did, you would expect the intensity of moonlight to follow some smooth curve - but in particular you would not expect the intensity to change much right around the full moon (because the illuminated area doesn't change a lot). The light coming from the Sun is reflected by the dust and rocks at the surface of our satellite.
See the reflectance below from However, the moon does not appear pinkish, and that must be because of the way the eye works (not physics). The moon shines because its surface reflects light from the sun. But they are in fact all the same shade of gray.There is a good description of the composition of the moon and its color But there is one other very cool thing. Here is another example of just how our eyes fool us:It is reasonable to say that the little rectangle on the left looks white, while it looks gray on the right; and whether you consider it gray or white in the middle depends on your screen brightness, probably.
A grey object reflects light of all wavelengths equally with less than 100% efficiency. Look out for your Lunchtime Genius newsletter in your inbox soon. @RobJeffries, Our perception of "white", and "gray" and "black" is highly subjective. When you see the same surface up there in the night sky it looks "white" because there's nothing brighter up there against which your eye can compare it.There's something wrong with that article and with that spectrum.
When you look at the intensity of the moon as it goes through its phases, you expect there to be more moonlight when the moon is full - obviously, since the "disk" of light is bigger. It is perfectly possible for @Rahul Grey is achromatic - colourless.
Therefore it appears that a plausible explanation is nothing more than that the two spectra below are insufficiently different for our eyes to perceive them as differently coloured. @Rob: There is no such thing as grey light, but there is such a thing as a grey object. Similarly, elements do not have some intrinsic colour, and they are not emitting "grey" light. And I will make it clear what the photographs show in my answer. Also note that the scale is linear.
The saturated photo shows this and a discerning eye can perceive the light color tint in the non-saturated photo.To subscribe to this RSS feed, copy and paste this URL into your RSS reader.
On this basis, the spectrum of the moon could be considered pinkish, as the reflectance of sunlight (which appears almost white to the human eye) is twice as effective at red wavelengths than blue.
The answer can only be that the lunar spectrum is close enough to (what we perceive as) white that we are unable to see it as coloured.The apparent magnitude of the brightest star is dim (Sirius at -1.4) compared to the Moon at -12.
So is Antares ("not Mars"), as is Betelgeuse. A shade of white. The best answers are voted up and rise to the top Those two spectra would be much closer to one another had intensity been placed on a logarithmic scale.In this answer you say "could be considered pinkish", but conclude that the spectrum is "close enough" to be called white.
There are two effects in play:This second point explains the really sharp peak right around full moon - and this is why the moon looks particularly bright and white at that time (barring atmospheric effects).This is described in more depth (and I just discovered it has a name: See also this image I took, it does not appear white, one of the seas looks blue.
When you are outside looking in, you are no longer adapted to that white point.It is not the integrated magnitude that matters is it?
"It isn't, it is (something), but it appears like that because (something)"@HarryCBurn No, it is not a "different colour". All three are orders of magnitude less luminous than is the Moon.
The transmission properties of the Earth's atmosphere on the apparent colour of the moon are very small compared to the reflectance spectrum which is heavily weighted towards the red. Apollo astronauts described its colour as ‘brownish’. Walk outside and look at the window of the room. The lighter color rocks are usually plagioclase feldspar, while the darker rocks are pyroxene.During the day, the Moon has to compete with sunlight, which is also being scattered by the atmosphere, so it looks white.Gray is not a color - it is a shade. However, much of the lunar surface contains minerals that are naturally grey and these dominate the colour we perceive from Earth.Discover our latest special editions covering a range of fascinating topics from the latest scientific discoveries to the big ideas explained.Listen to some of the brightest names in science and technology talk about the ideas and breakthroughs shaping our world.
If it did, you would expect the intensity of moonlight to follow some smooth curve - but in particular you would not expect the intensity to change much right around the full moon (because the illuminated area doesn't change a lot). The light coming from the Sun is reflected by the dust and rocks at the surface of our satellite.
See the reflectance below from However, the moon does not appear pinkish, and that must be because of the way the eye works (not physics). The moon shines because its surface reflects light from the sun. But they are in fact all the same shade of gray.There is a good description of the composition of the moon and its color But there is one other very cool thing. Here is another example of just how our eyes fool us:It is reasonable to say that the little rectangle on the left looks white, while it looks gray on the right; and whether you consider it gray or white in the middle depends on your screen brightness, probably.
A grey object reflects light of all wavelengths equally with less than 100% efficiency. Look out for your Lunchtime Genius newsletter in your inbox soon. @RobJeffries, Our perception of "white", and "gray" and "black" is highly subjective. When you see the same surface up there in the night sky it looks "white" because there's nothing brighter up there against which your eye can compare it.There's something wrong with that article and with that spectrum.