LifeWiki:Did you know/170
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... that seven spaceships have been proved to be the smallest possible for their speed and period: glider for period-4 c/4 diagonal, LWSS for period-4 c/2 orthogonal, 64P2H1V0 for period-2 c/2 orthogonal, 30P5H2V0 for period-5 2c/5 orthogonal, 25P3H1V0.1 and 25P3H1V0.2 for period-3 c/3 orthogonal and 37P4H1V0 for period-4 c/4 orthogonal?