Kok's galaxy is a volatility-1 period-8 oscillator found by Jan Kok in 1971. In September 2003 Jason Summers found a 12-glider synthesis of this oscillator.
Kok's galaxy serves as the logo of Golly.
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:
The period-856 glider gun uses four, which serve as sparkers and also delete gliders.
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.
Kok's galaxy currently requires 11 gliders to build, via perturbing an arrangement of two beehives. Attempts to reduce this synthesis have been made, although none have proven to be successful.
- 28P8.1 at Heinrich Koenig's Game of Life Object Catalogs