A c/7 spaceship is a spaceship travelling at one seventh of the speed of light. The first such spaceship to be discovered was the diagonally traveling lobster, found by Matthias Merzenich in August 2011. The first known orthogonal c/7 spaceship was the loafer, discovered by Josh Ball in February 2013. A Caterloopillar has been configured to move at c/7.
- Michael Simkin (April 16, 2016). Re: Caterloopillar WIP (all speeds < c/4) (discussion thread) at the ConwayLife.com forums