# Difference between revisions of "Main Page"

Welcome to the explain xkcd wiki!

We have collaboratively explained 6 xkcd comics, and only 2003 (100%) remain. Add yours while there's a chance!

## Latest comic

 Hertzsprung-Russell Diagram Title text: The Hertzsprung-Russell diagram is located in its own lower right corner, unless you're viewing it on an unusually big screen.

## Explanation

 This explanation may be incomplete or incorrect: Created by a RED GIANT - Please change this comment when editing this page. Do NOT delete this tag too soon.

The Hertzsprung–Russell diagram is a scatterplot showing absolute luminosities of stars against its effective temperature or color. It's generally used to understand a star's age.

The axes are labeled in Kelvin (degrees Celsius above absolute zero) and, in a unlike many Hertzsprung–Russell diagrams, Watts. While most Hertzsprung–Russell diagrams are labelled in units of solar luminosity or absolute magnitude, all three are perfectly valid measures of luminosity, which refers to the total power emitted by the sun.

Regular Hertzsprung–Russell diagrams start at about 1000K and what is labeled on this diagram as 1021 watts—i.e. the upper-left corner. This diagram has been extended to lower magnitudes on both axes. The joke comes from the absurdity of showing tiny (at least compared to stars) and often mundane objects on a diagram meant for stars. Though not included in the diagram, the title text notes that the screen displaying the diagram would probably be plotted somewhere in the lower right corner.

## Transcript

Is this out of date?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.