Pulsar
Pulsar  
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Pattern type  Oscillator  

Number of cells  48  
Bounding box  15×15  
Frequency class  12.1  
Period  3  
Mod  3  
Heat  42.7  
Volatility  0.73  
Strict volatility  0.73  
Rotor type  Pulsar  
Discovered by  John Conway  
Year of discovery  1970  
 
 
 

Pulsar (rarely referred to as Cambridge pulsar CP 485672^{[note 1]}) is a large but surprisingly common period 3 oscillator. It was found very early on by John Conway.
The rotor of a pulsar consists of four mutually stabilizing quadrants; alternate arrangements exist for any odd multiple of 4 (for the version with 12 copies, see quasar). A closely related oscillator — the pulsar quadrant — includes just the external "horns" of the rotor and can be stabilized on its own.
Commonness
Despite its size, pulsar is the fourth most common oscillator (and the most common of period greater than 2) in Achim Flammenkamp's census; the only oscillators more common are blinker, toad, and beacon.^{[1]} It is by far the most common period 3 oscillator, being about 45,000 times more common than jam.^{[2]} Overall, the pulsar is the twentyfirst most common object on Adam P. Goucher's Catagolue.^{[3]}
See also
Notes
 ↑ The numbers refer to the populations of the three phases. The Life pulsar was indeed discovered at Cambridge, like the first real pulsar a few years earlier.
References
 ↑ Achim Flammenkamp (September 7, 2004). "Most seen natural occurring ash objects in Game of Life". Retrieved on January 15, 2009.
 ↑ Adam P. Goucher. "Census". Catagolue. Retrieved on October 27, 2018.
 ↑ Adam P. Goucher. "Statistics". Catagolue. Retrieved on June 24, 2016.
External links
 Pulsar at the Life Lexicon
 48P3.6 at Heinrich Koenig's Game of Life Object Catalogs
 Patterns
 Patterns with Catagolue frequency class 12.1
 Natural periodic objects
 Oscillators with 48 cells
 Patterns with 48 cells
 Patterns found by John Conway
 Patterns found in 1970
 Patterns that can be constructed with 3 gliders
 Oscillators
 Periodic objects with minimum population 48
 Oscillators with period 3
 Oscillators with mod 3
 Oscillators with heat 42
 Oscillators with volatility 0.73
 Oscillators with strict volatility 0.73
 Oscillators with rotor Pulsar
 Patterns with complete square symmetry
 Sparkers
 Weak sparkers
 Sparkers with period 3