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Title text: The Hertzsprung-Russell diagram is located in its own lower right corner, unless you're viewing it on an unusually big screen.
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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) for effective temperature and, in a unlike many Hertzsprung–Russell diagrams, Watts for luminosity. 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 star (or other body). Effective temperature refers to temperature of a blackbody with the same surface area and luminosity. This is meant to provide an estimate of the surface temperature of the object.
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.
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