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File:Spiral galaxy arms diagram.png

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Original file (4,373 × 2,744 pixels, file size: 423 KB, MIME type: image/png)

Description
English: A diagram of how arms form in spiral galaxies.
Date 19:15, 16 January 2005
Source
Author user:Dbenbenn


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 copyright holder of this work, hereby publish it under the following licenses:
GNU head 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.
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
This licensing tag was added to this file as part of the GFDL licensing update.
w:en:Creative Commons
attribution share alike
This file is licensed under the Creative Commons Attribution-Share Alike 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
You may select the license of your choice.

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Date/TimeThumbnailDimensionsUserComment
current20:29, 26 September 2016Thumbnail for version as of 20:29, 26 September 20164,373 × 2,744 (423 KB)CmdrjamesonCompressed with pngout. Reduced by 744kB (63% decrease).
04:41, 27 October 2005Thumbnail for version as of 04:41, 27 October 20054,373 × 2,744 (1.14 MB)Dbenbennthumbnail, since MediaWiki won't thumbnail PNGs that are more than 12.5 megapixels
19:15, 16 January 2005Thumbnail for version as of 19:15, 16 January 20055,154 × 3,234 (193 KB)DbenbennDiagram of how arms form in spiral galaxies
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