25P3H1V0.1

25P3H1V0.1
7b2obo5b$4b2obob2ob3ob$b4o2b2o6bo$o4bo3bo3b2ob$b2o! #C [[ THUMBSIZE 2 THEME 6 GRID GRIDMAJOR 0 SUPPRESS THUMBLAUNCH ]] #C [[ AUTOSTART ]] #C [[ TRACKLOOP 3 0 -1/3 THUMBSIZE 3 GPS 3 HEIGHT 240 WIDTH 660 ]]
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Pattern type	Spaceship
Number of cells	25
Bounding box	16 × 5
Direction	Orthogonal
Period	3 (mod: 3)
Speed	c/3 | c/3
Heat	20
Kinetic symmetry	n
Discovered by	Dean Hickerson
Year of discovery	1989
Rules Outer-totalistic rules B3/S23 – B378/S023678 # of rules 26 = 64 Isotropic rules B3-ceky/S2-n3-y – B2n34cewz5-ary6-c78/S0234acentw5-j678
Glider synthesis Fewest gliders 16† Catagolue-generated RLE synthesis Uploaded synthesis RLE 25p3h1v0.1_synth.rle †Can be constructed with 15 gliders using the reverse caber tosser universal constructor.
Pattern files Plaintext 25p3h1v0.1.cells RLE 25p3h1v0.1.rle
Identifiers apgcode xq3_16614e8o4aa82cc2 Pentadecathlon ID 25P3H1V0.1 Eppstein ID 13881

25P3H1V0.1 is an unnamed c/3 orthogonal spaceship discovered by Dean Hickerson in August 1989, being one of the first c/3 spaceships to be discovered. In terms of its 25 cells, it is tied with 25P3H1V0.2 as the smallest c/3 spaceship, although unlike that ship, it has a population of 25 in all of its phases, as well as a smaller bounding box. It also has edge-repair capacities.

Additional components

This spaceship is capable of pulling a 16-cell tagalong, resulting in a 41-cell spaceship.

Occurrence

Main article: List of natural spaceships

At 25 cells, it is one of the three smallest spaceships yet to appear from soup, alongside crab and 25P3H1V0.2.

Glider synthesis

Martin Grant discovered a glider synthesis for 25P3H1V0.1 on January 6, 2015. Goldtiger997 and Tanner Jacobi reduced this synthesis to 19 gliders on October 5, 2020, then Goldtiger997 reduced it to 16 by simplifying its final step on July 31, 2025, making 25P3H1V0.1 the cheapest c/3 spaceship to construct, tied with Edge-repair spaceship 1.

Gun

On February 21, 2026, Entity Valkyrie posted a period-240 gun for the spaceship.

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The period-240 gun, which also acts as a surprisingly extensive showcase of Life technology. (click above to open LifeViewer)

See also

• 84P3H1V0.1
• Edge-repair spaceship 1
• Brain
• Dart
• Turtle

External links

• 25P3H1V0.1 at the Life Lexicon
• Life (B3/S23) at David Eppstein's Glider Database
• 25P3H1V0.1 at Heinrich Koenig's Game of Life Object Catalogs
• 25P3H1V0.1 at Adam P. Goucher's Catagolue