Heavyweight spaceship

From LifeWiki
Jump to: navigation, search
Heavyweight Spaceship
3b2o$bo4bo$o$o5bo$6o! #C [[ THEME 6 GRID GRIDMAJOR 0 THUMBLAUNCH AUTOSTART ]] #C [[ TRACKLOOP 4 -1/2 0 THUMBSIZE 2 GPS 4 ]]
Pattern type Spaceship
Family XWSS
Number of cells 13
Bounding box 7×4
Direction Orthogonal
Period 4
Mod 2
Speed c/2
Heat 19
Discovered by John Conway
Year of discovery 1970

The heavyweight spaceship (commonly abbreviated to HWSS) or (rarely) big fish is the fourth most common spaceship after the glider, lightweight spaceship and middleweight spaceship. It was found by John Conway in 1970 and travels at a speed of c/2 orthogonally. Its domino spark can be used to stabilize several tagalongs, including sidecar and half of x66. It is one of only three known spaceships that is a polyomino in any of its phases.

The side and tail sparks allow an HWSS to make changes to other objects without being affected itself -- a "Heisenburp" effect. For example, gliders approaching from behind can be deleted in five different ways, or can be converted into a block, B-heptomino, or beehive, as shown below.


The HWSS is the thirty-fifth most common object on Adam P. Goucher's Catagolue.[1]

It is the fourth most common natural spaceship that is not a flotilla, being less common than the middleweight spaceship but about 171,000,000 times more common than the Coe ship.

Image gallery

Three Heavyweight spaceship eaters
Example collisions between HWSS and forward-traveling glider
Download RLE: click here


  1. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.

See also

External links

  • 13P4H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs