Editing 1733: Solar Spectrum
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==Explanation== | ==Explanation== | ||
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This comic's release day was postponed from the scheduled Wednesday release to a [[:Category:Thursday comics|Thursday release]] because [[Randall]] noticed the extreme popularity of the previous comic on Monday: [[1732: Earth Temperature Timeline]]. Randall even explained this in the header text; see [[1732#Popularity_of_comic|this trivia item]] from the previous comic. | This comic's release day was postponed from the scheduled Wednesday release to a [[:Category:Thursday comics|Thursday release]] because [[Randall]] noticed the extreme popularity of the previous comic on Monday: [[1732: Earth Temperature Timeline]]. Randall even explained this in the header text; see [[1732#Popularity_of_comic|this trivia item]] from the previous comic. | ||
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All ten extra lines (including both the labeled and unlabeled ones) seem to correspond to the [http://astro.u-strasbg.fr/~koppen/discharge/silicon.jpg spectrum of silicon], and '''the joke then refers to the {{w|silicon dioxide}} (aka glass)''' used in the lenses of the Sun's sunglasses. Of course, this means that the glasses have been ionized and turned into plasma by the heat of the sun. | All ten extra lines (including both the labeled and unlabeled ones) seem to correspond to the [http://astro.u-strasbg.fr/~koppen/discharge/silicon.jpg spectrum of silicon], and '''the joke then refers to the {{w|silicon dioxide}} (aka glass)''' used in the lenses of the Sun's sunglasses. Of course, this means that the glasses have been ionized and turned into plasma by the heat of the sun. | ||
− | The idea of a sun with sunglasses is a reference to pictures/clipart of the sun wearing sunglasses, often used to denote good weather. Randall has specifically used this picture in at least two | + | The idea of a sun with sunglasses is a reference to pictures/clipart of the sun wearing sunglasses, often used to denote good weather. Randall has specifically used this picture in at least two [[what if?]] posts: |
:In ''{{what if|115|Into the Sun}}'' it is seen in the fourth image. The title text of that image even references the fact that those sunglasses will block the light to Earth: | :In ''{{what if|115|Into the Sun}}'' it is seen in the fourth image. The title text of that image even references the fact that those sunglasses will block the light to Earth: | ||
::A partial solar eclipse is when the Earth moves across the part of the Sun blocked by its sunglasses. | ::A partial solar eclipse is when the Earth moves across the part of the Sun blocked by its sunglasses. | ||
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|759.370 | |759.370 | ||
|N/A | |N/A | ||
− | |This line is outside | + | |This line is outside comics range. So are the two unlabeled lines shown in the spectrum in the picture above around 720 and 730 nm. There are also even more oxygen lines further out in the infrared part of the spectrum which is not even included in the picture above. |
|- | |- | ||
|None | |None | ||
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|690 | |690 | ||
|Those giant sunglasses 5 | |Those giant sunglasses 5 | ||
− | |This is the fifth of the five xkcd | + | |This is the fifth of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read off manually |
|- | |- | ||
|B | |B | ||
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|686.719 | |686.719 | ||
|Oxygen 2 | |Oxygen 2 | ||
− | |Agreement | + | |Agreement |
|- | |- | ||
|None | |None | ||
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|577 | |577 | ||
|Those giant sunglasses 4 | |Those giant sunglasses 4 | ||
− | |This is the fourth of the five xkcd | + | |This is the fourth of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read off manually. |
|- | |- | ||
|None | |None | ||
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|660 | |660 | ||
|Unlabeled | |Unlabeled | ||
− | |This line is not labeled | + | |This line is not labeled either in the comic or in the picture above. Wavelength read off manually. It seems like this one was supposed to be one of the sunglasses lines, and then by mistake the arrow points to the labeled line C below. |
|- | |- | ||
|C | |C | ||
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|656.281 | |656.281 | ||
|Those giant sunglasses 3 | |Those giant sunglasses 3 | ||
− | |This is the third of the five xkcd sunglass lines. This is actually the | + | |This is the third of the five xkcd sunglass lines. This is actually the {{w|Hα}} line belonging to the {{w|hydrogen}} {{w|Balmer series}}. Seems like a mistake, and more likely it was meant for the arrow to point to the unlabeled line mentioned here above. |
|- | |- | ||
|None | |None | ||
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|645 | |645 | ||
|Those giant sunglasses 2 | |Those giant sunglasses 2 | ||
− | |This is the second of the five xkcd | + | |This is the second of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read off manually. |
|- | |- | ||
|a | |a | ||
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|627.661 | |627.661 | ||
|Oxygen 1 | |Oxygen 1 | ||
− | |Agreement | + | |Agreement |
|- | |- | ||
|D<sub>1</sub> | |D<sub>1</sub> | ||
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|589.592 | |589.592 | ||
|Sodium 2 | |Sodium 2 | ||
− | |Agreement. There | + | |Agreement. There are only one label (Sodium) in the comic above these two close lines. |
|- | |- | ||
|D<sub>2</sub> | |D<sub>2</sub> | ||
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|588.995 | |588.995 | ||
|Sodium 1 | |Sodium 1 | ||
− | |Agreement. There | + | |Agreement. There are only one label (Sodium) in the comic above these two close lines. |
|- | |- | ||
|D<sub>3</sub> or d | |D<sub>3</sub> or d | ||
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|587.5618 | |587.5618 | ||
|N/A | |N/A | ||
− | |This line is so close to the nearest sodium line that only one line is visible, so | + | |This line is so close to the nearest sodium line that only one line is visible, so only one is shown, both in the comic and in the picture above. |
|- | |- | ||
|None | |None | ||
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|577 | |577 | ||
|Those giant sunglasses 1 | |Those giant sunglasses 1 | ||
− | |This is the first of the five xkcd | + | |This is the first of the five xkcd sunglass lines. This line is not labeled in the picture above. Wavelength read off manually. |
|- | |- | ||
|None | |None | ||
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|554 | |554 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength | + | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength read off manually. |
|- | |- | ||
|None | |None | ||
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|549 | |549 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength | + | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength read off manually. |
|- | |- | ||
|None | |None | ||
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|537 | |537 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength | + | |Agreement. This line is not labeled either in the comic or in the picture above. Wavelength read off manually. |
|- | |- | ||
|E<sub>2</sub> | |E<sub>2</sub> | ||
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|518.362 | |518.362 | ||
|Magnesium 2 | |Magnesium 2 | ||
− | |Agreement. See | + | |Agreement. See b below. There are only one label (Magnesium) in the comic above these two close lines. |
|- | |- | ||
|b<sub>2</sub> | |b<sub>2</sub> | ||
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|516.891 | |516.891 | ||
|N/A | |N/A | ||
− | |This iron line and the next magnesium line are so close that only one is visible in the spectrum, so only one is shown, both in the comic and in the picture above. There is only one label for both visible lines showing them to be magnesium, even though there are four lines (this one is | + | |This iron line and the next magnesium line are so close that only one is visible in the spectrum, so only one is shown, both in the comic and in the picture above. There is only one label for both visible lines showing them to be magnesium, even though there are four lines one of which (this one is Iron). |
|- | |- | ||
|b<sub>4</sub> | |b<sub>4</sub> | ||
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|516.733 | |516.733 | ||
|Magnesium 1 | |Magnesium 1 | ||
− | |Agreement. See | + | |Agreement. See b above. There are only one label (Magnesium) in the comic above these two close lines. |
|- | |- | ||
|c | |c | ||
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|486.134 | |486.134 | ||
|Hydrogen 3 | |Hydrogen 3 | ||
− | |Agreement with | + | |Agreement with {{w|Hβ}}. |
|- | |- | ||
|h | |h | ||
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|476 | |476 | ||
|Unlabeled | |Unlabeled | ||
− | |Agreement. This line is also unlabeled in the table on Wikipedia. " | + | |Agreement. This line is also unlabeled in the table on Wikipedia. "h" is used between H and g below. The wavelength is manually read off from the image. |
|- | |- | ||
|d | |d | ||
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|434.047 | |434.047 | ||
|Hydrogen 2 | |Hydrogen 2 | ||
− | |Agreement with | + | |Agreement with {{w|Hγ}}. |
|- | |- | ||
|G | |G | ||
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|410.175 | |410.175 | ||
|Hydrogen 1 | |Hydrogen 1 | ||
− | |Agreement with | + | |Agreement with {{w|Hδ}}. |
|- | |- | ||
|H | |H |