Lightweight spaceship

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Lightweight spaceship
bo2bo$o$o3bo$4o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 4 -1/2 0 THUMBSIZE 2 GPS 4 ]]
Pattern type Spaceship
Family XWSS
Number of cells 9
Bounding box 5 × 4
Frequency class 11.2
Direction Orthogonal
Period 4
Mod 2
Speed c/2
Speed (unsimplified) 2c/4
Heat 11
Discovered by John Conway
Year of discovery 1970

The lightweight spaceship (commonly abbreviated to LWSS) or (rarely) small fish[1] is the smallest orthogonal spaceship, and the second most common spaceship after the glider. It moves at speed c/2 and has period 4 (and is therefore often referred to as 2c/4). It was found by John Conway in 1970.

Tagalong

In April 1992, David Bell found a tagalong for two lightweight spaceships (or two middleweight spaceships or two heavyweight spaceships). It can be extended indefinitely by attaching it to the back of itself. Interestingly, a hivenudger with symmetric rear (that is, both rear spaceships being of same "weight") can pull this tagalong.

x = 25, y = 19, rule = b3/s23 21bo3b$18b4o3b$13bo2bob2o5b$13bo11b$4o8bo3bob2o5b$o3bo5b2ob2obobob5o$o 9b2obobobo2b5o$bo2bo2b2o2bo3b3o2bob2ob$6bo2bob2o12b$6bo4b2o12b$6bo2bob 2o12b$bo2bo2b2o2bo3b3o2bob2ob$o9b2obobobo2b5o$o3bo5b2ob2obobob5o$4o8bo 3bob2o5b$13bo11b$13bo2bob2o5b$18b4o3b$21bo! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ TRACKLOOP 4 -1/2 0 THUMBSIZE 2 GPS 4 AUTOSTART ]]
Tagalong for two lightweight spaceships
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RLE: here Plaintext: here

Commonness

Main article: List of common spaceships

Random soups investigated by Achim Flammenkamp emitted one LWSS for approximately every 615 gliders.[2] The LWSS is also the eighteenth most common object on Adam P. Goucher's Catagolue.[3]

Glider synthesis

All strict still lifes with a population of 20 or fewer cells, as well as all oscillators and spaceships with 16 or fewer cells, are known to be glider-constructible. A glider synthesis of this object can be found in the infobox to the right.

See also

References

  1. "Small fish". The Life Lexicon. Stephen Silver. Retrieved on June 10, 2009.
  2. "Spontaneous appeared Spaceships out of Random Dust". Achim Flammenkamp (December 9, 1995). Retrieved on August 18, 2011.
  3. Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.

External links