Optical pulsars

Known pulsars were emitting microwaves, and no visible ones had been found. Now the first optical pulsar was detected near the center of the Crab nebula, which was also emitting X-rays.
 Cocke, Disney, and Taylor England 1969 Optical pulsars

Known pulsars were emitting microwaves, and no visible ones had been found. Now the first optical pulsar was detected near the center of the Crab nebula, which was also emitting X-rays.