Answer: pulsar

AnswerCrossword Clue
PULSAR

Celestial radio source

PULSAR

Astronomical flasher

PULSAR

Star that spins

PULSAR
Cosmic blinker
PULSAR
Radiation-emitting star
PULSARSeiko brand
PULSARWatch brand
PULSARStar first seen in 1967
PULSARSource of radio waves
PULSARRotating neutron star
PULSARCelestial radio-wave source
PULSARCelestial source of radio waves
PULSARNeutron star
PULSARRadio wave emitter
PULSARAstronomical object
PULSARAstronomical discovery of 1967
PULSARCelestial object
PULSARRadio wave producer
PULSARHeavenly radio source
PULSARDistant radiation source
PULSARWatch word?
PULSARRadio telescope target
PULSARStar that emits radio waves
PULSARSupernova leftover
PULSARRapidly rotating star that emits radio waves
PULSARDistant source of radio waves
PULSARCelestial object that emits radio waves