3c/7 orthogonal is an orthogonal speed that is equivalent to three sevenths of the speed of light.
Stephen Silver discovered a 3c/7 orthogonal wave in 2000.
On June 11, 2016 Tim Coe discovered the first 3c/7 orthogonal spaceship, the spaghetti monster. It can support the aforementioned object. This currently is the only spaceship known of this speed.
A 3c/7 puffer was created by Luka Okanishi on 1 March 2017.
- ↑ Luka Okanishi. Re: Spaceship Discussion Thread (discussion thread) at the ConwayLife.com forums