File:Spiral galaxy arms diagram.png
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DescriptionSpiral galaxy arms diagram.png |
English: A diagram of how arms form in spiral galaxies. |
Date | 19:15, 16 January 2005 |
Source |
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Author | user:Dbenbenn |
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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.
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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.http://www.gnu.org/copyleft/fdl.htmlGFDLGNU Free Documentation Licensetruetrue |
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This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. | |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:29, 26 September 2016 | ![]() | 4,373 × 2,744 (423 KB) | commons>Cmdrjameson | Compressed with pngout. Reduced by 744kB (63% decrease). |
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Horizontal resolution | 314.95 dpc |
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Vertical resolution | 314.95 dpc |