A c/5 spaceship is a spaceship travelling at one fifth of the speed of light. The first such spaceship to be discovered was the snail, found by Tim Coe in January 1996. The first diagonally moving example, 295P5H1V1, was found by Jason Summers in November 2000. For other c/5 ships see 58P5H1V1, 67P5H1V1, 86P5H1V1 and spider. A Caterloopillar has also been configured to move at c/5.
- Michael Simkin (April 16, 2016). Re: Caterloopillar WIP (all speeds < c/4) (discussion thread) at the ConwayLife.com forums