Image:Spiral galaxy arms diagram.png

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Image in higher resolution (4373 × 2744 pixel, file size: 1.14 MB, MIME type: image/png)

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Diagram of orbits that form the appearance of spiral arms

This file has been superseded by Image:Spiral galaxy arms diagram.svg.

It is recommended that the other file be used.
Reason: A vector version of this file is now available.

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* {{CheckUsage|Spiral_galaxy_arms_diagram.png|Image:Spiral galaxy arms diagram.svg|superseded}} was superseded by [[:Image:Spiral galaxy arms diagram.svg]]. A vector version of this file is now available. --~~~~

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A diagram of how arms form in spiral galaxies. I made it with the following Metapost program:

Linethickness = 3pt;
scale = 4in;

beginfig(1);
  pickup pencircle scaled Linethickness;

  for i = 0 upto 11 :
    draw fullcircle scaled ((1 - i/12) * scale)
        xscaled 1.6 rotated (-110/11 * i);
  endfor;
  currentpicture := currentpicture shifted (2*scale, scale);
endfig;
end;

Compile with mpost, open in Gimp, resolution 800, "try bounding box", gray, weak anti-aliasing. Crop, save as PNG.

I, the author of this work, hereby publish it under the following licenses:

Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the section entitled "GNU Free Documentation License".

This file is licensed under Creative Commons Attribution ShareAlike 2.0 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one.

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Image:Spiral galaxy arms diagram.png

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