Period-20 glider gun
|Period-20 glider gun|
|View static image|
|Number of cells||600|
|Discovered by|| Matthias Merzenich|
|Year of discovery||2013|
Period-20 glider gun is a true period-20 glider gun that was discovered by Matthias Merzenich in 2013 and improved by Karel Suhajda, based on Elkies' true period 24 gun. Further improvements have been made since. This is the shortest-period true-period gun known so far.
Filtering the output of the gun with a blocker yields the smallest known period-40 glider gun, beating the eponymous period-40 glider gun at its own game. The further addition of Rich's p16 doubles the period again, resulting in the smallest known period-80 gun, and adding 68P32.1 on top of that doubles the period once more to 160.