Linear propagator
From LifeWiki
Linear propagator  
Pattern type  Puffer  

Direction  Orthogonal  
Period  237228617  
Speed  256c/237228617  
Number of cells  290096  
Bounding box  14826990×14826908  
Discovered by  Dave Greene  
Year of discovery  2013  

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Linear propagator is arguably the first explicit example of a replicator in Conway's Game of Life found by Dave Greene on November 23, 2013, depending on an exact definition of a replicator.^{[1]}
As the pattern is too big to be displayed in detail using any reasonable scale (given one pixel were 1 mm, the whole pattern would be almost 15 km wide), the image on the right depicts only the underlying universal constructor.
References
 ↑ Dave Greene (November 23, 2013). "Re: Geminoid Challenge". Retrieved on October 18, 2015.