Negative spaceship

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A negative spaceship is a a type of signal traveling through a periodic agar such as zebra stripes. The leading edge of the signal removes the agar, and the trailing edge rebuilds the agar some time later. The distance between the two edges is sometimes adjustable, as shown in lightspeed bubble. The central part of the "spaceship" may consist of dying sparks or even simple empty space.

Below is a sample period-5 negative spaceship, found by Hartmut Holzwart in March 2007, travelling to the left at the speed of light:

x = 55, y = 31, rule = B3/S23:T55,32 55o2$29o2b3o2b19o$30b2o3b2o$24o2b3o3b2o3b4o2b12o$25b2o15b2o$24o2b3o3b 2o5b2o3b2o2b7o$30b2o3bob2o8b2o$24o2b3o2b3o3b2o5b2o3b6o$25b2o12b2ob2o$ 24o3b5o10b2o5b6o$28bo15b2ob2o$24o5bo9bo7b2o2b4o$25bobo6bo3bo10b2o$24o 3bobob5o6bo7b5o$30b3o3bo6bo$24o3bobob5o6bo7b5o$25bobo6bo3bo10b2o$24o5b o9bo7b2o2b4o$28bo15b2ob2o$24o3b5o10b2o5b6o$25b2o12b2ob2o$24o2b3o2b3o3b 2o5b2o3b6o$30b2o3bob2o8b2o$24o2b3o3b2o5b2o3b2o2b7o$25b2o15b2o$24o2b3o 3b2o3b4o2b12o$30b2o3b2o$29o2b3o2b19o2$55o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBNAIL THUMBSIZE 2 THEME 6 HEIGHT 480 GPS 6 ZOOM 11 AUTOSTART ]]
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