Silverfish

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Silverfish
Silverfish image
Pattern type Spaceship
Number of cells 217043
Bounding box 11970×48047
Direction Orthogonal
Period 240
Mod 240
Speed 31c/240
Speed (unsimplified) 31c/240
Heat 128931
Discovered by Chris Cain
Dave Greene
Adam P. Goucher
Year of discovery 2020
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The silverfish is a 31c/240 orthogonal spaceship that was constructed on May 9, 2020.[1] Various reductions brought it down to its current size of 217,043 cells,[2] making it the smallest known spaceship of this speed, surpassing the centipede caterloopillar in cell count (and, as a result, making the smallest 31c/240 spaceship true-period again).

References

  1. Adam P. Goucher (May 9, 2020). Re: 31c/240 caterpillar working notes (discussion thread) at the ConwayLife.com forums
  2. Dave Greene (May 13, 2020). Re: 31c/240 caterpillar working notes (discussion thread) at the ConwayLife.com forums