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<font size=5px>''Welcome to the '''explain [[xkcd]]''' wiki!''</font>
  
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We have collaboratively explained [[:Category:Comics|'''{{#expr:{{PAGESINCAT:Comics}}-9}}''' xkcd comics]],
''Welcome to the '''Explain xkcd''' wiki!''
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<!-- Note: the -9 in the calculation above is to discount subcategories (there are 8 of them as of 2013-02-27),
We currently have [[:Category:Comics|'''{{#expr:{{PAGESINCAT:Comics}}-3}}''' comic explanations]]. Come and [[List of all comics|add yours]]!
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    as well as [[List of all comics]], which is obviously not a comic page. -->
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and only {{#expr:{{LATESTCOMIC}}-({{PAGESINCAT:Comics}}-9)}}
 
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<h2>Latest comic</h2>
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remain. '''[[Help:How to add a new comic explanation|Add yours]]''' while there's a chance!
 
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== Latest comic ==
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<span style="float:right;">[[{{LATESTCOMIC}}|'''Go to this comic explanation''']]</span>
 
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{{#ifexist:Talk:{{LATESTCOMIC}}|<h2>Discussion</h2>
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<small>''Is this out of date? {{Purge|Clicking here will fix that}}.''</small>
  
 
== New here? ==
 
== New here? ==
Feel free to sign up for an account and contribute to the Explain XKCD wiki!  We need explanations for comics, characters, themes, memes and everything in between.  If it is referenced in an [http://www.xkcd.com XKCD] web comic, it should be here.
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<div style="float:right; margin: 0 0 1em 1em">{{Special:ContributionScores/10/7/nosort,notools}}<div style="font-size:0.85em; width:25em; font-style:italic">[[Special:ContributionScores|Lots of people]] contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account [[Special:UserLogin/signup|here]].</div></div>
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You can read a brief introduction about this wiki at [[explain xkcd]]. Feel free to sign up for an account and contribute to the wiki!  We need explanations for comics, characters, themes, memes and everything in between.  If it is referenced in an [[xkcd]] web comic, it should be here.
  
 
* If you're new to wikis like this, take a look at these help pages describing [[mw:Help:Navigation|how to navigate]] the wiki, and [[mw:Help:Editing pages|how to edit]] pages.
 
* If you're new to wikis like this, take a look at these help pages describing [[mw:Help:Navigation|how to navigate]] the wiki, and [[mw:Help:Editing pages|how to edit]] pages.
  
* Discussion about various parts of the wiki is going on at [[Explain XKCD:Community portal]]. Share your 2¢!
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* Discussion about various parts of the wiki is going on at [[Explain XKCD:Community portal]]. Share your 2¢!
  
* [[List of all comics]] contains a complete table of all XKCD comics so far and the corresponding explanations. The red links ([[like this]]) are missing explanations. Feel free to help out by creating them!
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* [[List of all comics]] contains a complete table of all xkcd comics so far and the corresponding explanations. The red links ([[like this]]) are missing explanations. Feel free to help out by creating them! '''[[Help:How to add a new comic explanation|Here's how]]'''.
  
 
== Rules ==
 
== Rules ==
Don't be a jerk. There are a lot of comics that don't have set in stone explanations, feel free to put multiple interpretations in the wiki page for each comic.
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Don't be a jerk. There are a lot of comics that don't have set in stone explanations; feel free to put multiple interpretations in the wiki page for each comic.
  
If you want to talk about a specific comic, use its Discussion.
+
If you want to talk about a specific comic, use its discussion page.
  
Please only submit material directly related to&mdash;and helping everyone better understand&mdash;xkcd... and of course ''only'' submit material that can legally be posted (and freely edited.)  Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users posting such are at risk of being blocked.
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Please only submit material directly related to —and helping everyone better understand— xkcd... and of course ''only'' submit material that can legally be posted (and freely edited.)  Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.
  
 
If you need assistance from an admin, feel free to leave a message on their personal discussion page. The list of admins is [[Special:ListUsers/sysop|here]].
 
If you need assistance from an admin, feel free to leave a message on their personal discussion page. The list of admins is [[Special:ListUsers/sysop|here]].
  
 
[[Category:Root category]]
 
[[Category:Root category]]

Revision as of 21:16, 24 March 2013

Welcome to the explain xkcd wiki!

We have collaboratively explained Expression error: Unrecognised punctuation character ",". xkcd comics, and only Expression error: Unrecognised punctuation character ",". (Expression error: Unrecognised punctuation character ",".%) remain. Add yours while there's a chance!

Latest comic

Go to this comic explanation

Spectroscopy
Although right now I'm more excited about ESPRESSO's radial velocity measurements, so I'm listening to This Kiss, her song about measuring "centrifugal motion" on "a rooftop under the sky".
Title text: Although right now I'm more excited about ESPRESSO's radial velocity measurements, so I'm listening to This Kiss, her song about measuring "centrifugal motion" on "a rooftop under the sky".

Explanation

Ambox notice.png This explanation may be incomplete or incorrect: Just the basics. More info needed and links etc.

This comic mixes the method of using spectroscopy to detect oxygen on exoplanets (planets outside our Solar system) with the lyrics for the Faith Hill song "Breathe".

From the lyrics:

I watch the sunlight - examining the spectra of a remote star
dance across your face - examining the transition of the planet across the star
I can feel you breathe - determining that breathable oxygen exists.

In the comic the word feel have been changed to see.

Measuring the light output of stars (spectra) we are able to determine a number of details of the star, including rotation, relative radial velocity, chemical composition, temperature and to some degree, distance and size. As the planet pictured transitions between the star and the observer, and looking at the spectrum received, the viewer is able to determine that the planet is absorbing the specific wavelengths that molecular oxygen absorbs; a clear indication that the planet has large quantities of breathable oxygen.

http://www.huffingtonpost.com/2015/04/23/nasa-nexss-search-for-life_n_7123788.html


The title text refers to determining radial velocity in the ESPRESSO program. By noting that the radial velocity of the star changes slightly as the planet that orbits it moves around the star (centrifugal acceleration), the ESPRESSO program should be able to detect the masses of planets as they are moving towards the Earth in their orbit around their distant stars.

Transcript

[A dark panel with a bright star in the center. To the left a planet (drawn as a new moon) approaches the star. Text is written above in white with two musical notes, one on each side of the text.]
I watch the sunlight
[Same image but now the planet eclipses the star. Small lines around the planet indicate the atmosphere, as seen from the light from the star passing through it. Text is again written above in white with two different musical notes, one on each side of the text.]
Dance across your face
[A white frame with a black line. It Is the spectrum of the planets atmosphere. Two distinct absorbtion peaks are visible. The first one is labeled with an arrow. Text is again written above, now in black, with two, again, different musical notes, one on each side of the text.]
I can see you breathe
Label: O2
[Below the panels is the following caption:]
Faith Hill on exoplanet spectroscopy


Is this out of date? Clicking here will fix that.

New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes, memes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • List of all comics contains a complete table of all xkcd comics so far and the corresponding explanations. The red links (like this) are missing explanations. Feel free to help out by creating them! Here's how.

Rules

Don't be a jerk. There are a lot of comics that don't have set in stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to —and helping everyone better understand— xkcd... and of course only submit material that can legally be posted (and freely edited.) Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, feel free to leave a message on their personal discussion page. The list of admins is here.

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