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Gemini image
Pattern type Spaceship
Number of cells 846278
Bounding box 4217807 × 4220191
Direction Oblique
Slope 5
Period 33699586
Mod 33699586
Speed (2560,512)c/16849793
Speed (unsimplified) (5120,1024)c/33699586
Heat Unknown
Discovered by Andrew J. Wade
Year of discovery 2010

Gemini is the first oblique spaceship to be constructed, and was created by Andrew J. Wade in 2010.[1][2] It displaces itself by 5,120 cells vertically and 1,024 cells horizontally every 33,699,586 generations, and is therefore an ibisship. It derives its name from the latin, gemini, meaning twins, describing its 2 identical halves, each of which contains three Chapman-Greene construction arms.[3] A tape of gliders continually relays between the two halves, instructing each to delete its parent and construct a daughter configuration.

It is the largest spaceship in terms of its diameter and bounding box, but has a much smaller population than the Caterpillar.

The pattern marks the thirteenth explicitly-constructed spaceship velocity, but facilitates an infinite range of related velocities. For example, Dave Greene has reduced its period by eight generations, whilst maintaining its displacement. Theoretically speaking, a Gemini-esque spaceship could be constructed with any velocity slower than (but not equal to) (1,1)c/580.[4] In June 2010, Greene also constructed slope-2 and slope-3 versions of the spaceship.[5][6]

Gemini was voted Pattern of the Year for 2010 on the forums.[7]


Various zoom levels of gemini demonstrating its size
Some of Gemini's features (with CA music)

Pattern files

See also


  1. Oblique Life spaceship created at Game of Life News. Posted by Adam P. Goucher on May 19, 2010.
  2. Andrew J. Wade (May 18, 2010). Universal Constructor Based Spaceship (discussion thread) at the forums
  3. Dave Greene (February 4, 2022). Re: Thread for basic questions (discussion thread) at the forums
  4. Adam P. Goucher (May 21, 2010). "Universal Constructor Based Spaceship". Retrieved on May 21, 2010.
  5. Dave Greene (June 13, 2010). Re: Shrinking Gemini: Four Ideas (discussion thread) at the forums
  6. Dave Greene (June 14, 2010). Re: Shrinking Gemini: Four Ideas (discussion thread) at the forums
  7. Adam P. Goucher (January 17, 2011). Re: Votes for Pattern of the Year 2010 (discussion thread) at the forums

External links