Colors of the world around us: Difference between revisions
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Yes, but there's a lot of assumptions in there that | Yes, but there's a lot of assumptions in there that seem to add up to "...but not by much in a lot of practice". | ||
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One question is whether we could survive. | One question is whether we could survive. | ||
Another is whether eyes wouldn't naturally be selective in a similar 'looks like uniform spectrum to me' even though it isn't - | Another is whether eyes wouldn't naturally be selective in a similar 'looks like uniform spectrum to me' even though it isn't - the same is true for us with our sun. | ||
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Different gases might lead to other colors, | Different gases might lead to other colors, | ||
but there are relatively few gases which would have a significantly different effect | but there are relatively few gases likely to be abundant, most will be molecular gases so fairly small, | ||
and relatively few which would have a significantly different effect (TODO: back that). | |||
And if we want to not die from the atmosphere's contents, there's much tighter constraints. | And if we want to not die from the atmosphere's contents, there's much tighter constraints. | ||
Pressure also has an | Pressure also has an influence, but again, not so much in the range where human bodies want to live. | ||
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If we're talking Rayleigh scattering, | If we're talking Rayleigh scattering, | ||
we might get more or less of it of it, | we might get more or less of it of it, | ||
but this is mostly going to give us brighter or darker blues skies, not | but this is mostly going to give us brighter or darker blues skies, | ||
not wild colors within human-visible range. | |||
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Mars looks red, but not because of its atmosphere - the martian atmosphere is so thin that the Rayleigh components is tiny (TODO: figure out | Mars looks red, but not because of its atmosphere - the martian atmosphere is so thin that the Rayleigh components is tiny (TODO: figure out Rayleigh on CO2 - it seems to do the same, but the low pressure makes it less significant{{verify}}), so actually a clear martian sky looks almost black. | ||
But a clear sky is rare. | But a clear sky is rare. | ||
Latest revision as of 13:36, 9 October 2023
✎ This article/section is a stub — some half-sorted notes, not necessarily checked, not necessarily correct. Feel free to ignore, or tell me about it.
The sky
On sunsets
See also
Might other planet's skies be other colors?
The sun
(TEMPORARILY ELSEWHERE)