Image:Spiral galaxy arms diagram.png
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Diagram of orbits that form the appearance of spiral arms
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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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