Answer:

quasars

AnswerCrossword Clue
QUASARSHighly luminous cosmic objects
QUASARSLuminous cosmic objects
QUASARSDistant starlike objects
QUASARSStarlike objects
QUASARSHeavenly radiators
QUASARSCosmic rarities
QUASARSSpatial wave senders.
QUASARSStarlike, celestial objects
QUASARSSome TV's
QUASARSSome radio sources
QUASARSStellar phenomena