|View static image|
|Number of cells||846278|
|Bounding box||4217807 × 4220191|
|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. 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. A tape of gliders continually relays between the two halves, instructing each to delete its parent and construct a daughter configuration.
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. In June 2010, Greene also constructed slope-2 and slope-3 versions of the spaceship.
- Oblique Life spaceship created at Game of Life News. Posted by Adam P. Goucher on May 19, 2010.
- Andrew J. Wade (May 18, 2010). Universal Constructor Based Spaceship (discussion thread) at the ConwayLife.com forums
- Dave Greene (February 4, 2022). Re: Thread for basic questions (discussion thread) at the ConwayLife.com forums
- Adam P. Goucher (May 21, 2010). "Universal Constructor Based Spaceship". Retrieved on May 21, 2010.
- Dave Greene (June 13, 2010). Re: Shrinking Gemini: Four Ideas (discussion thread) at the ConwayLife.com forums
- Dave Greene (June 14, 2010). Re: Shrinking Gemini: Four Ideas (discussion thread) at the ConwayLife.com forums
- Adam P. Goucher (January 17, 2011). Re: Votes for Pattern of the Year 2010 (discussion thread) at the ConwayLife.com forums
- Gemini at the Life Lexicon
- New Scientist: First replicating creature spawned in life simulator
- Gemini guns at Game of Life News. Posted by Adam P. Goucher on July 30, 2010.
- downloadable zip of the Gemini RLE file (Google is not allowing to download the file, but you can Share->Email as attachment to yourself)
- Gemini RLE file with programs used to construct it (on Google docs so download quota may be exceeded by the time you attempt download.)
- Gemini RLE file with programs used to construct it (alternate download on drop.io)