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Questions tagged [light]

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Questions regarding electromagnetic radiation in the visible spectrum.

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Assuming a star emits a finite amount of light in finite directions. Is there a distance at which the discrete paths of light will have spread so far apart from each other so as to create voids? Voids ...
Tech God's user avatar
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2 votes
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Haumea is very interesting since it has an orbital period of centuries, but a day on Haumea is just 4 hours. What software can I use to calculate Haumea’s luminosity as viewed from the earth? I think ...
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10 votes
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I understand that due to the finite speed of light, we only see galaxies as they were in the past. Also, the universe is expanding, so galaxies we see today are not where they used to be. I've read ...
Pirya Kumari's user avatar
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2 votes
1 answer
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During partial solar eclipses, excluding those with magnitudes of 0.5, we can observe significant changes to the sky's color balance. On a typical day, the blue sky is visible, which is easily ...
Geographos's user avatar
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7 votes
1 answer
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I've seen this question in the prose of Pelevin, where it's only used to evoke thoughts. However, it's interesting to approach the question from a scientific point of view. My first though would be ...
kelin's user avatar
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I would like to convert the luminosity of the Sun to its absolute magnitude, preferably in Excel. I found the formula here: How to calculate the apparent magnitude of sun? but it's wrong, as I get -0....
Geographos's user avatar
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2 votes
0 answers
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I live in Southern Maine and two nights ago I was outside looking at the sky while taking my dog to do his business. I noticed what I thought was a satellite moving across the sky from east to west. I ...
Joseph Feely's user avatar
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-4 votes
2 answers
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If photons always follow geodesics, it would imply that a photon must be aware of the geodesic before it enters it.
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17 votes
3 answers
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Imagine you are on the (day-side) surface of the Moon, trying to read a book. You are oriented so that no direct sunlight reaches the pages (i.e. with the book cover facing the Sun). Since the Moon ...
summer's user avatar
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I'm doing some ecological modelling using a dataset of observations of wildlife taken at a bunch of different locations and times. I want to assess the extent to which these observations are ...
Peter Thompson's user avatar
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2 votes
1 answer
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What color is the moonlight? And does it's color temperature change along the day/night like the sun? By "What color is the moonlight" I need the hex code of the color, or it's color ...
Ahmed Dyaa's user avatar
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0 votes
1 answer
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Is there an equation to accurately measure the intensity of moonlight using the lunar altitude like in this question under natural conditions? By "under natural conditions" I mean "the ...
Ahmed Dyaa's user avatar
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0 votes
1 answer
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How can the intensity of sunlight throughout the day be calculated in comparison to its maximum intensity (at noon) using the solar altitude under natural conditions? By it's equations or python. By &...
Ahmed Dyaa's user avatar
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-4 votes
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When or at what altitude does the sun completely disappear from view? When does the effect of the sun on objects facing it begin, for example, the formation of shadows when sunlight hits objects? ...
Ahmed Dyaa's user avatar
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5 votes
3 answers
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Meteor are the visible phenomena caused by a meteoroid falling on Earth atmosphere. But what is the exact mechanism which produce this light? I mean; of course the meteor's atoms interact with the air ...
Hudson's user avatar
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