Kok's galaxy

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Kok's galaxy
2bo2bobob$2obob3ob$bo6bo$2o5bob2$bo5b2o$o6bob$b3obob2o$bobo2bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ GPS 4 THUMBSIZE 2 ]]
Pattern type Oscillator
Number of cells 28
Bounding box 13 × 13
Period 8
Mod 8
Heat 39
Volatility 1.00
Strict volatility 1.00
Discovered by Jan Kok
Year of discovery 1971

Kok's galaxy is a volatility-1 period-8 oscillator found by Jan Kok in 1971.[1][2]

Kok's galaxy serves as the logo of Golly.

Glider synthesis

In September 2003 Jason Summers found a 12-glider synthesis of this oscillator.[3]

Kok's galaxy currently requires 11 gliders to build, via perturbing an arrangement of two beehives. Attempts to reduce this synthesis have been made,[4] although none have proven to be successful.

Uses in catalysis

Kok's galaxy is one of the strongest p8 sparkers of its size, and is notable for allowing a reaction that converts a pi heptomino to a heavyweight spaceship when paired with a boat:

x = 54, y = 49, rule = B3/S23 6b3o$7bob3o$6b2o2bo2bo$6b5o3bo$7bo4b3o30b3o$12bo29b3obo$7bo32bo2bo2b2o $6bobo30bo3b5o$7bo31b3o4bo$13b2o26bo$13b2o31bo$45bobo$b2o43bo$b2o36b2o $39b2o2$51b2o$8b3o40b2o$7bo3bo$6bo5bo$6bo5bo$6bo5bo30b3o$7bo3bo30bo3bo $8b3o30bo5bo$41bo5bo$2b2o7b2o28bo5bo$3bo7bo30bo3bo$3o9b3o28b3o$o13bo9b o$22bobo16b2o7b2o$23b2o17bo7bo$39b3o9b3o$29bo9bo13bo$29bobo$29b2o4$18b 2o$15bo$14bobo2b2o$12bobob3o2bo$12bo2b6o$15b2ob2o6b2o$14b6o2bo2bobo$ 13bo2b3obobo3bo$14b2o2bobo$19bo$15b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ THUMBSIZE 2 WIDTH 800 HEIGHT 600 ZOOM 9 GPS 15 AUTOSTART ]]
A p48 HWSS gun using Kok's galaxy and two period-48 glider guns (click above to open LifeViewer)
RLE: here Plaintext: here

The period-856 glider gun uses four, which serve as sparkers and also delete gliders.


Main article: List of common oscillators

Kok's galaxy is still yet to occur naturally. Catagolue has a dedicated badge which will be given out to anyone who discovers one. In odd-width 90° rotationally symmetric soups (C4_1), 1 in 100000 soups will form a Kok's galaxy in the centre.

See also


  1. Robert Wainwright (September 1971). Lifeline, vol 3, page 4.
  2. Dean Hickerson's oscillator stamp collection. Retrieved on March 14, 2020.
  3. Jason Summers' jslife pattern collection.
  4. Dave Greene (February 2, 2022). Re: Synthesising Oscillators (discussion thread) at the ConwayLife.com forums

External links