A trigger is a signal, usually a single glider, that collides with a seed constellation to produce a relatively rare still life or oscillator, or an output spaceship or other signal. For example, all turners and freeze-dried constellations are triggerable. The seed constellation is destroyed or damaged in the process, unlike a circuit or reflector which recovers completely and can be re-used.
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"Trigger" is also used when a spaceship reacts with another object to cause a reaction to occur whenever desired (but perhaps only at particular intervals). The object being triggered lies dormant until the reaction is required.
- Dave Greene (January 1, 2018). "Re: Spaceship Discussion Thread". Retrieved on January 28, 2018.