Lightweight spaceship

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 ]]
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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
Rules Outer-totalistic rules B3/S23 – B3468/S2378 Important rules Conway Life, HighLife # of rules 25 = 32 Isotropic rules B3aij/S2eik3aijnr – B2kn345-a67e8/S1e234-aw5-jy6-kn78
Glider synthesis Fewest gliders 3 Catagolue-generated RLE lwss_synth.rle Uploaded synthesis RLE lwss_synth.rle
Pattern files Plaintext lwss.cells RLE lwss.rle
Identifiers apgcode xq4_6frc Pentadecathlon ID 9P4H2V0.1 Eppstein ID 1062

The lightweight spaceship (commonly abbreviated to LWSS) or (rarely) small fish 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 (click above to open LifeViewer) 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. The LWSS is also the eighteenth most common object on Adam P. Goucher's Catagolue.

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

• Fake xWSS
• Middleweight spaceship, Heavyweight spaceship, LWSS on MWSS 1, LWSS on HWSS 1
• Lightweight emulator
• Toaster
• Infinite LWSS hotel
• G-to-LWSS

External links

• LWSS at the Life Lexicon
• Life (B3/S23) at David Eppstein's Glider Database
• Lightweight spaceship at Adam P. Goucher's Catagolue
• LWSS on LWSS at Adam P. Goucher's Catagolue (pseudo-object)
• xWSS Tagalong at Adam P. Goucher's Catagolue
• The 1 nine-bit spaceship at Mark D. Niemiec's Life Page
• 9P4H2V0.1 at Heinrich Koenig's Game of Life Object Catalogs